"Rendering aborted due to complexity issues. If this is valid markdown, please feel free to open an issue and attach the original markdown to the issue."

Since the latest update this is shown on almost all markdown files. I just did what the error message suggested, since I couldn't find another open issue for it.

Just open Gitlab's own changelog to have an example.

https://gitlab.com/gitlab-org/gitlab/-/blob/ad9d86b4f3f48b7585e262ee1bfc5d28bb9e9ed6/CHANGELOG.md