The cause of the crash was that asset libraries are freed, but the filtered
trees used for things like node tool menus weren't marked dirty, so we
continued to use the freed asset data. On a design level this is quite
concerning because it means the lifetimes of the asset tree caches and
the asset system's asset libraries are connected tenuously.
Eventually there should be a better solution, but I found the simplest
fix for now is just to add a notifier when opening a new file that causes
the asset tree caches to be tagged dirty.
Pull Request: https://projects.blender.org/blender/blender/pulls/124254
80a0c4237a