Delurking to see if anyone has seen this behaviour. Yesterday I updated to MacOS 13.2 and my Finder sidebar reset to the default configuration. All the items I added to the sidebar manually are gone. Not a big deal to add them again but I’ve never seen this before.
I think that happened to me too.
Leastwise, I recall having to drag over the folders I prefer to have there again.
Good to know, thanks!