Seems similar to an earlier issue: Empty Chats after Update to 8.2.0
I’m still on 8.1.1, as all messages remain visible in this version.
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Any chance everyone with disappearing messages is using HTTP and not HTTPS? Could be related this this bug report on Github: Messages are stored and searchable, but message list becomes empty after refresh in channels and DMs · Issue #40152 · RocketChat/Rocket.Chat · GitHub
I have not successfully transitioned to HTTPS to confirm that this matter has been resolved. As a Docker-only user, enabling debug mode and delving into logs isn’t as easy as it may seem.