I wonder if this is still the case as most comments petered out end of March. There was a nasty bug discovered in Emacs JSONRPC-Library, which did cause spurious LSP connect errors and likely other issues in LSP server communication
Do note that many users might have not been aware of this issue. The fixed library is part of Emacs 29. If you are not on Emacs 29 you might pull in a more recent JSONRPC-package from ELPA in which case it will shadow the inbuilt/pre-shipped library.
Personally, I have never seen this desynchronization issue between eglot and corfu. I suspect it somewhat depends on the particular LSP server, and I only really heavily use eglot for C# (OmniSharp).
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=8bf4c...
Do note that many users might have not been aware of this issue. The fixed library is part of Emacs 29. If you are not on Emacs 29 you might pull in a more recent JSONRPC-package from ELPA in which case it will shadow the inbuilt/pre-shipped library.