Error on restoring session with crates.nvim

[shushtain]

If I quit a session that has crates.nvim attached to one of the buffers, I get this error on entering the session:

Although there is "rmagatti/auto-session" at play, I don't understand how to read this quite vague error to understand who and what initiates the error. I get similar errors when quitting while in the help file of a lazy-loaded plugin, but making crates.nvim load with lazy = false doesn't help.

If I disable either crates.nvim or auto-session, the issue disappears. But I can confirm the LSP mentioned is crates.nvim LSP, because it happens only when it's attached. Since auto-session doesn't mind other LSPs, I thought I'd ask here first.

Does crates.nvim create a hidden buffer that can't be restored afterwards, or does it do something creative with the buffer it attaches to by any chance?

Thanks for the help!

[saecki]

Kind of forgot about this. crates.nvim creates an ad-hoc language server by passing a configuration to vim.lsp.start, possibly the session plugin tries to restart the language server, but since it's not configured anywhere, it fails.
I've been thinking that we could probably use the way neovim 0.11 handles lsp configuration, but I haven't gotten around to it yet.

[shushtain]

Maybe there is a way to solve this without much refactoring by either: stopping the server on something like VimLeave, or clearing autocmds tied to it on a similar event. But I wouldn't know for sure. Anyway, thanks for the answer.