These errors can all happen if WebSocket connections are failing from your browser. I logged in to the account owning that Clone link, opened the app, and everything worked just fine from here. So I would guess that this is something to do with your browser (an extension, perhaps), computer or network. Can you confirm whether the apps are failing when accessed from a different device on a different Internet connection?
You’re right, this is being caused my AdGuard on my Mac and trying to access through Safari. Strangely, I have no issues with Firefox or Edge. The only solution with Safari was to disable AdGuard entirely.
This must be a change from AdGuard that I have to explore. Ad blockers at it again…
More than one time here someone has asked why their build was failing and I could not replicate the issue after attempting scores of any realistic combination of settings I could think of.
Now I can cross off one more thing on my “reasons you think yourself cracked” list.