I spend a lot of time on a programming board backed by Discourse (elixirforum.com).
I get randomly logged out 4-5 per day. This doesn't happen in any other browser I've used it with, including Safari (others are: Firefox, Arc, and Chrome).
I'm on a macOS 15.3.2 (24D81)
This does NOT happen on mobile.
I asked about this on Reddit and a couple of people have said they have experienced it.
That I don't get logged out.
Version 0.99.132.0.3-beta (WebKit 621.1.2.111.4)
Sequoia (15)