I think the main culprit of this problem is your LNURL server gives html response instead of json. Seems there are some misconfiguration in LNBits.
Discussion
hmm seems weird. This is a Raspiblitz TOR-only node and it doesn’t seem like any others have this problem by the looks of the Raspiblitz repo.
Oh, running from raspiblitz package? Yes, i'm not sure. Maybe new LNBits introduce some changes and raspiblitz doesn't package it correctly. Need to check the LNBits code and debug it manually 😅
I’ll try to set LNBits up with my self-compiled CLN node, we’ll see if it works better there