As of May 17th, I'm having an issue with Proton Pass (popular extension) on the Orion RC. I had issues connecting (as documented above), and once logged in, it does not autofill any websites.
It's working in the regular Orion browser. As a Orion+ Lifetime member, I'd love to use the latest version, but not having a working password manager is a deal breaker for me, so I'm back to the free version of Orion.