Gpt-5.4 hangs due to prompt issue.

[dileepyavan]

Gpt-5.4 hangs when tools are not being used for simple prompts caused due to a prompt issue.

[vs-code-engineering]

Hi @dileepyavan. As a member of the team, you can help us triage this issue by referring to https://github.com/microsoft/vscode-copilot/wiki/Copilot-Inbox-Tracker and assigning an owner directly.

[amunger]

used Ulugbek's repro and a couple other prompts to verify