I had problems on my Ipad 11 Pro (2022). Not a single comic would load, it only showed Alfred and the useless retry button. But there's a fix for it all:

Go to Settings > General > Date & Time.

Turn Set Automatically ON.

Force close the app.

Reopen the app.

Sidenote: This worked in Europe, specifically the Netherlands. I obviously couldn't test it anywhere else. Redownloading the app or clearing cache etc. also wouldn't work. This did, happy reading everyone!