I'm still on BIAB 2021. After reading this thread, I tried opening the Notation window while running BIAB on a test volume with Sonoma. That caused a message to appear that said something like, "the developer needs to update this application for compatibility with this version of macOS" (I should have taken a screenshot for exact wording). Then BIAB "unexpectedly quit" (crashed!).

I usually only upgrade BIAB every few years so I wasn't planning on getting 2023. I think I know the answer to this, but is there any chance that previous versions of BIAB could get this fix for Sonoma as well?

I do have another Mac that can't be upgraded to Sonoma so I can run it there if I need to. I don't always use the Notation window so 2021 might be useable for me on my primary Mac which will run Sonoma full-time eventually.