Seems that cross-knot forking is broken. This used to work for me but now whenever I do so the client hangs after pressing the fork button and then takes me to a blank page. Reloading or going to the newly created fork also results in a blank page. This resulted in 4 broken repos on my account (core, core-lRC, core-kZQ and core-jsk). DevTools show nothing of note either while forking or when trying to view the broken repos. Just that the response to trying to view the broken repo is entirely empty thus the blank page.
Monorepo for Tangled
tangled.org