In Language Server mode is there a way to invalidate referenced files

[tm1000]

I have have my project. Then I have my files that references vendor folder. Vendor folder is not part of my project (in Psalm.xml) but there are references in Psalm Language Server to libraries in vendor. The issue is that if composer is updated then the references are stale. I've tried a few different ways to invalidate the cache Psalm is using (like reloadFiles() on codebase) but I always wind up with the old references (or errors on new functions added). Is there a way to invalidate referenced files and get them to be re-scanned? Maybe there is a bug in reloadFiles