The string 'pip' is not removed after selecting one item from completion list of 'pip'

[v-chenzha]

OS: All
Build Version: 20241128.1
Regression: Not a Regression

Repro Steps:

1. Open the dependson-with-copy2.zip template file in VS Code.
2. Navigate to the ARM Template Outline view.
3. Click on the second resource [concat(${vmName},copyIndex(1),'nic1')] (networkInterfaces).
4. Delete the existing dependsOn property and type pip.
5. Select an item from the completion list.
6. Check whether the pip is removed in the dependsOn property.

Expect:
The pip is removed in the dependsOn property.

Actual:
The pip is not removed in the dependsOn property.

More Info:
This issue doesn't reproduce when typing "pip" and 'pip'.