All newly created UIDocument game objects share the exact same name in the Hierarchy, Refer to the attached video

Steps to repro:
1. Create a new project
2. Hierarchy > Create > UI Toolkit > UI Document
3. Repeat step 2

Actual Result:
UIDocument objects are created with the same name

Expected Result:
UIDocument objects should be created with a different name as UIDocument1, UIDocument2, UIDocument3, and so on

Note: UIDocument object is introduced in 2021.2.0a4

Reproducible in:
2021.2.0a7, 2021.2.0a4

Environment:
Occurring on Windows 10 & Mac 10.15.