There was an api error: No Instance found matching provided domain. Have you remembered to register it?

I've been noticing a bug whenever I go to the page of an instance that doesn't yet exist in the database:

Usually after refreshing, the page shows as usual (assuming after Fediseer was able to download/parse the instance's /api/v1/instance or /.well-known/nodeinfo-2.0 or whatever). Anyone else encounter this? I'm on Firefox 118.0.2 (64-bit) on Fedora release 38 (Thirty Eight)

Plus a funny devtools thing I saw for the spinner lol: https://streamable.com/lgg7xy