Chromium - right click menus and system bar button do not render
Nevermind they fixed it in an update. Right click menus and system title bar behave as expected (even with hardware acceleration turned on).
Edit - Problem had persisted over a number of updates. Snaps update without your consent so I can't really tell how many, but it had been there for about a week when I posted the question. Anyway it's fixed now in snap version 97.0.4692.99