[Bug] Duplicate options displayed in command completion menu

Bug Description
I am seeing duplicate options in the list of options when I enter "/". It's also impossible to navigate the menu options using the up and down arrow keys.

Environment Info

• Platform: linux
• Terminal: vscode
• Version: 2.1.143
• Feedback ID: df84b831-a5e4-4e26-b3dd-0cfcf86d49ca

Errors

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<img width="1018" height="708" alt="Image" src="https://github.com/user-attachments/assets/c90342b8-84a9-4f19-8627-5a5435971807" />