Pro subscription routing to GPT-5.3 Mini for 48+ hours — no reset timer visible [Case #10179682]

The issue is still affecting my Pro account on the ChatGPT web in Chrome, where all chats are automatically routed to 5.5 mini even though I manually select 5.6 Pro.

Support case: #[11735133]

A recent affected conversation, timestamp and timezone, client details, and the sanitized HAR have all been provided privately inside the support case.