I tried this with a blank site, fresh install version 12.1.0 and it doesn't work on the beta channel. that's why I wrote that version 12.1.0 is not a stable version but a dead end, after a few updates it reaches the database crash and ends there the site becomes unrecoverable. make a backup copy before trying, you will have to work hard for this update. The problem appears when updating modules after updating a core.