"Uncaught ReferenceError" appears in dev console if add a new tag and place the mouse cursor over it

[chalov-anton]

Preconditions

1. Install Magento with Adobe Stock Integration
2. Configured integration in Stores -> Configuration -> Advanced-> System -> Adobe Stock Integration fieldset
3. Enhanced Media Gallery Enabled
4. Uploaded image

Steps to reproduce (*)

1. Select the uploaded image by clicking on it
2. Click "three dots", select Edit
3. Place the cursor on New Keyword field and type in some text, "test" for example
4. Click Add New Tag
   (the tag appeared in Tags drop-down)
5. Click on Tags drop-down to expand it
6. Place the mouse cursor over the previously added test tag
   

Actual result (*)

❌ Uncaught ReferenceError: $index is not defined at UiClass.mousemove (eval at createBindingsStringEvaluator (knockout.js:2982) error appears in dev console

[m2-assistant]

Hi @chalov-anton. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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