1. It’s the same in a clean profile — so it’s not corruption in my profile
2. It’s the same in Chrome (with a clean profile) and Firefox (with a clean profile) — so it’s not a javascript issue (?)
… no 400’s on loading the javascript packages …
browser is Version 96.0.4664.110 (Official Build) (64-bit), but since the multisite works in the same browser, this should not be the issue?