BYOK "selectedCompletionModel" Bug

[Dhakra92]

github.copilot.selectedCompletionModel switch does not work properly.

2026-06-06 23:26:57.349 [info] Copilot Chat: 0.52.2026060505, VS Code: 1.124.0-insider
2026-06-06 23:26:57.356 [info] AuthenticationService: firing onDidAuthenticationChange from handleAuthChangeEvent. Has token: true
2026-06-06 23:26:57.356 [info] copilot token sku: monthly_subscriber_quota
2026-06-06 23:26:57.357 [info] [code-referencing] Public code references are enabled.
2026-06-06 23:26:57.357 [info] [User selected model Utility-Qwen3.6 35B (customendpoint) is not in the list of generic models: gpt-41-copilot, falling back to default model.] 
2026-06-06 23:26:57.364 [info] ccreq:c22e209e.copilotmd | quotaExceeded | gpt-4o-mini-2024-07-18 | 690ms | [copilotLanguageModelWrapper]
2026-06-06 23:26:57.364 [info] ccreq:1a97cdb1.copilotmd | quotaExceeded | gpt-4o-mini-2024-07-18 | 689ms | [copilotLanguageModelWrapper]
2026-06-06 23:26:57.364 [info] ccreq:8360d736.copilotmd | quotaExceeded | gpt-4o-mini-2024-07-18 | 687ms | [copilotLanguageModelWrapper]