I am using the API via Templater, and have found an easily reproducible bug with app.vault.adapter.write(), but since Templater is a plugin, the bug report forum is disallowed and I cannot find a forum for bug reports for the core API.
I think something like this should go in Developers: Plugin & API - Obsidian Forum, but I’ll defer to one of the team (or other mods) to move it to the appropriate spot.