PRU Quota Wiped Out, very likely related to enabling Assisted Permissions

Describe the bug

I believe the issue is very likely related to enabling assisted permissions, since there were no problems before it was turned on.

• Subscription: Copilot Pro (Annual Plan / Legacy Request-based PRU).
• August 11 Incident: With 234 PRUs remaining in my allowance, I sent 1 single prompt, and my remaining quota was instantly wiped out to 0.
• September 2 Incident (Today): My quota reset today for the new billing cycle. I sent 1 single prompt in a brand-new session, and my entire September PRU allowance was instantly wiped out to 0 again.
• Historical Context: Prior to August 11, I had used this annual plan for over 16 months without any issue. This is a newly introduced recurring bug, not a normal usage behavior.

The request consumption shown in Copilot CLI is correct, but the actual backend consumption is wrong.

Affected version

No response

Steps to reproduce the behavior

1. Legacy Request-based PRU Account
2. Switch to Assisted Permissions
3. Send Prompt

Since a single prompt wiped out my entire monthly quota, I’m unable to repeat the test.

Expected behavior

No response

Additional context

Github Support Ticket #4720186

Beginne mit dem in der Issue beschriebenen Pfad für assisted-permissions und der Berichterstattung zum Quotenverbrauch, und vergleiche dann den vom CLI angezeigten Request-Verbrauch mit dem Backend-Kontingent nach einem Prompt. Keine Quelldatei oder kein Test ist angegeben, eine Reproduktion ist derzeit nicht möglich, weil das Kontingent erschöpft ist, und das erwartete Verhalten ist nicht ausdrücklich angegeben; die Abschlusskriterien müssen daher von einem Maintainer geklärt werden.