Requests causing 500 errors when verifying OAuth application registration do not have errors logged

[sarayourfriend]

Description

Some OAuth application verification requests end in 500 responses, but there are no matching logs with stack traces or any information to debug these errors and fix them.

The fact that multiple requests were sent for the same verification token (redacted in the screenshot above, but it's all one verification token) might be a clue.

Reproduction

No idea how to reproduce. We need to look at the code and see if there are things swallowing errors without logging or making these invisible in logs. We might need to add speculative logs if we can't find anything in the code that we think is causing this.

Additional context

Prioritised as high because these errors have no information other than they are a server-crashing error... which means there isn't anything to go off of to say they aren't "high" or "critical" except for that they are rare (which could be an accident of obscurity than actually a difficult-to-cause edge case).