Internal assertion error from "library/lib.ml"

[westpaddy]

Editing or viewing .v files in this (ConCert) project, I sometimes get the following error.

After the error, vscoq becomes unstable, resulting in most of the functionality does not work.

This seems the same issue found at the this zulip-archive.

Reproduction steps

I'm afraid I cannot find a small error reproduction process.
The following is the instruction for reproducing the error using the ConCert project.

Suppose vscoq is installed on vscode.
Run the following command to build the project and open a vscode workspace.

git clone https://github.com/AU-COBRA/ConCert.git
cd ConCert
opam switch create . 4.14.2 --repositories default,coq-released=https://coq.inria.fr/opam/released --deps-only
eval $(opam env)
make
opam install vscoq-language-server
cd execution
code .

Now open multiple files, for example, theories/Blockchain.v and theories/BoundedN.v.
We will get the error message.