[BUG] Deleting instance then creating new instance launches stale model

[AlexCheema]

Describe the bug

Deleting an instance, creating a new one, then sends a chat completion request with the old, stale instance.

To Reproduce

Steps to reproduce the behavior:

1. Create instance of Qwen3-30B
2. Delete instance
3. Create instance of Llama 3.2 3B
4. Chat (model selector shows Llama 3.2 3B selected)
5. It sends a request to wrong model, Qwen3-30B

Expected behavior

It should automatically select the most recently launched model. The model selector already shows the correct model. But it should actually use that model when chatting.

Actual behavior

It uses the wrong model, the previously launched model.

Environment

• macOS Version: 26.2
• EXO Version: c1be5184b2787bb11bc16c72789d0afd7b6b5510
• Hardware: Any
• Interconnection: Any