[Submix][Content Browser] - Deleting an unsaved Submix asset (any type) causes them to reappear when creating a new asset

Deleting unsaved Submix assets causes them to reappear the next time you create a new asset.

Issue does not occur in 4.26, but does occur in 4.27 and 5.0.

1) Open any project
2) In the Content Browser, go to Sounds > Mix and select any of the Submix asset types (Sound Submix, Soundfield Submix, Endpoint Submix, etc.)
3) Delete the asset you created
4) Repeat step 2

Expected Result:
 The asset you deleted stays deleted

Actual Result:
 The deleted asset reappears

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