I just had the genius (if I may say so myself) idea of starting Orion from LLDB and running it that way gives a whole bunch more output than just starting it on the cli:
2024-03-26 22:24:49.032456+0100 Orion[32184:1892600] [IPC] Received an invalid message 'WebPageProxy_DidPerformImmediateActionHitTest' from the WebContent process with PID 32201
2024-03-26 22:24:49.032502+0100 Orion[32184:1892600] [Process] AuxiliaryProcessProxy::terminate: PID=32201
2024-03-26 22:24:49.032617+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::didClose: (web process 32201 crash)
2024-03-26 22:24:49.032635+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::processDidTerminateOrFailedToLaunch: reason=Crash
2024-03-26 22:24:49.032648+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::shutDown:
2024-03-26 22:24:49.032653+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::processWillShutDown:
2024-03-26 22:24:49.032816+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e1613d0 - [PID=0] ProcessThrottler::didDisconnectFromProcess:
2024-03-26 22:24:49.032838+0100 Orion[32184:1892600] [Process] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32201] WebPageProxy::processDidTerminate: (pid 32201), reason=Crash
2024-03-26 22:24:49.034624+0100 Orion[32184:1892600] [Media] VideoPresentationManagerProxy::invalidate(C4EA417F)
2024-03-26 22:24:49.034646+0100 Orion[32184:1892600] [Fullscreen] VideoPresentationManagerProxy::invalidate(C4EA417F)
2024-03-26 22:24:49.034655+0100 Orion[32184:1892600] [Fullscreen] VideoPresentationManagerProxy::~VideoPresentationManagerProxy(C4EA417F)
2024-03-26 22:24:49.034660+0100 Orion[32184:1892600] [Fullscreen] VideoPresentationManagerProxy::invalidate(C4EA417F)
2024-03-26 22:24:49.034664+0100 Orion[32184:1892600] [Media] VideoPresentationManagerProxy::~PlaybackSessionManagerProxy(C4EA417F)
2024-03-26 22:24:49.034676+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::processTerminated:
2024-03-26 22:24:49.034706+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32201] WebPageProxy::dispatchProcessDidTerminate: reason=Crash
2024-03-26 22:24:49.034789+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32201] WebPageProxy::reload:
2024-03-26 22:24:49.034824+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32201] WebPageProxy::launchProcessForReload:
2024-03-26 22:24:49.034836+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32201] WebPageProxy::launchProcess:
2024-03-26 22:24:49.034841+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::removeWebPage: webPage=0x10f902a20, pageProxyID=125, webPageID=126
2024-03-26 22:24:49.034869+0100 Orion[32184:1892600] [Process] 0x11e1617c0 - [PID=32202] WebProcessProxy::setWebsiteDataStore() dataStore=0x11fa09178, sessionID=2
2024-03-26 22:24:49.034875+0100 Orion[32184:1892600] [Process] 0x11e04dc00 - NetworkProcessProxy::sendXPCEndpointToProcess(0x11e1617c0) state = 1 has connection = 1 XPC endpoint message = 0x0
2024-03-26 22:24:49.035020+0100 Orion[32184:1892600] [Process] 0x11e1617c0 - [PID=32202] WebProcessProxy::markIsNoLongerInPrewarmedPool:
2024-03-26 22:24:49.035031+0100 Orion[32184:1892600] [ProcessSwapping] 0x10f88b408 - WebProcessPool::processForRegistrableDomain: Using prewarmed process (process=0x11e1617c0, PID=32202)
2024-03-26 22:24:49.035038+0100 Orion[32184:1892600] [Process] 0x11e1617c0 - [PID=32202] WebProcessProxy::addExistingWebPage: webPage=0x10f902a20, pageProxyID=125, webPageID=126
2024-03-26 22:24:49.035074+0100 Orion[32184:1892600] [Media] VideoPresentationManagerProxy::PlaybackSessionManagerProxy(C4EA417F)
2024-03-26 22:24:49.035083+0100 Orion[32184:1892600] [Fullscreen] VideoPresentationManagerProxy::VideoPresentationManagerProxy(C4EA417F)
2024-03-26 22:24:49.036459+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32201] WebProcessProxy::destructor:
2024-03-26 22:24:49.036487+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e1613d0 - [PID=0] ProcessThrottler::invalidateAllActivities: BEGIN (foregroundActivityCount: 0, backgroundActivityCount: 1)
2024-03-26 22:24:49.036495+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e1613d0 - [PID=0] ProcessThrottler::invalidateAllActivities: END
2024-03-26 22:24:49.104136+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e04dc00 - NetworkProcessProxy is taking a background assertion because a web process is requesting a connection
2024-03-26 22:24:49.172766+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::decidePolicyForNavigationAction: frameID=2, isMainFrame=1, navigationID=4
2024-03-26 22:24:49.176013+0100 Orion[32184:1892600] [AppSSO] 0x11e000a20 - SOAuthorizationCoordinator::tryAuthorize
2024-03-26 22:24:49.176346+0100 Orion[32184:1892600] [AppSSO] 0x11e000a20 - SOAuthorizationCoordinator::tryAuthorize: The requested URL is not registered for AppSSO handling. No further action needed.
2024-03-26 22:24:49.176361+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::decidePolicyForNavigationAction: listener called: frameID=2, isMainFrame=1, navigationID=4, policyAction=0, safeBrowsingWarning=0, isAppBoundDomain=0, wasNavigationIntercepted=0
2024-03-26 22:24:49.176376+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::receivedNavigationPolicyDecision: frameID=2, isMainFrame=1, navigationID=4, policyAction=0
2024-03-26 22:24:49.176552+0100 Orion[32184:1892600] [ProcessSwapping] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::decidePolicyForNavigationAction: keep using process 32202 for navigation, reason=Process has not yet committed any provisional loads
2024-03-26 22:24:49.176587+0100 Orion[32184:1892600] [Process] 0x11e1617c0 - [PID=32202] WebProcessProxy::canTerminateAuxiliaryProcess: returns false (pageCount=1, provisionalPageCount=0, suspendedPageCount=0, m_isInProcessCache=0, m_shutdownPreventingScopeCounter=0)
2024-03-26 22:24:49.202201+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::didStartProvisionalLoadForFrame: frameID=2, isMainFrame=1
2024-03-26 22:24:49.202238+0100 Orion[32184:1892600] [PerformanceLogging] 0x10f88b408 - WebProcessPool::prewarmProcess: Prewarming a WebProcess for performance
2024-03-26 22:24:49.202249+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=0] WebProcessProxy::constructor:
2024-03-26 22:24:49.202718+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e29a3c0 - [PID=0, throttler=0x11e1613d0] ProcessThrottler::Activity::Activity: Starting foreground activity / 'WebProcess initialization'
2024-03-26 22:24:49.213174+0100 Orion[32184:1892600] [Loading] 0x11e1617c0 - [PID=32202] WebProcessProxy::didStartProvisionalLoadForMainFrame:
2024-03-26 22:24:49.213379+0100 Orion[32184:1892600] [Process] ResourceInterceptor::decidePolicyForResourceRequestAsync
2024-03-26 22:24:49.213872+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e0918e0 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::Activity: Starting background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.216032+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e0918e0 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::invalidate: Ending background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.293163+0100 Orion[32184:1892600] [Process] ResourceInterceptor::decidePolicyForResourceResponseAsync
2024-03-26 22:24:49.294211+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e2996a0 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::Activity: Starting background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.294982+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e0a44c0 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::Activity: Starting background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.295998+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e2996a0 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::invalidate: Ending background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.297154+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e0a44c0 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::invalidate: Ending background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.301600+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::didNavigateWithNavigationDataShared:
2024-03-26 22:24:49.302258+0100 Orion[32184:1892600] [Loading] 0x10f902a20 - [pageProxyID=125, webPageID=126, PID=32202] WebPageProxy::didCommitLoadForFrame: frameID=2, isMainFrame=1
2024-03-26 22:24:49.305343+0100 Orion[32184:1892600] [Process] 0x11e161200 - [PID=32203] WebProcessProxy::didFinishLaunching:
2024-03-26 22:24:49.356404+0100 Orion[32184:1892600] [Process] ResourceInterceptor::decidePolicyForResourceRequestAsync
2024-03-26 22:24:49.356833+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e0a4e20 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::Activity: Starting background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.356936+0100 Orion[32184:1892600] [Process] ResourceInterceptor::decidePolicyForResourceRequestAsync
2024-03-26 22:24:49.357291+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e091080 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::Activity: Starting background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.357422+0100 Orion[32184:1892600] [Process] ResourceInterceptor::decidePolicyForResourceRequestAsync
2024-03-26 22:24:49.357746+0100 Orion[32184:1892600] [ProcessSuspension] 0x11e093d60 - [PID=0, throttler=0x11e160290] ProcessThrottler::Activity::Activity: Starting background activity / 'RemoteObjectRegistry invocation'
2024-03-26 22:24:49.357844+0100 Orion[32184:1892600] [Process] ResourceInterceptor::decidePolicyForResourceRequestAsync
(This continues on for a bit, seems like the new process launching.)