Tacketh Slack reckons that Orion (current version of webkit I guess) will not be supported in March next year: Not sure if this is posted in the right spot, but does not seem like a bug - apologies either way!
eirk Slack likely is identifying Orion as Safari 17 or earlier https://slack.com/help/articles/1500001836081-Slack-support-lifecycle-for-operating-systems-app-versions-and-browsers
