Someone reported this the other day, on IRC IIRC.

https://beta.musicbrainz.org/doc/MusicBrainz_Database/Schema#Schema - the image is too small to read comfortably, but there's no way to get to the bigger image from the /doc page itself. The only option is to notice the tiny link to the wiki at the bottom of the page and read the wiki page instead, completely defeating the point of having transcluded pages.