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!