Animation Editor incorrectly warning about multiple parts sharing the same name

Issue Type: Other
Impact: High
Frequency: Constantly
Date First Experienced: 2021-02-08 01:02:00 (-08:00)
Date Last Experienced: 2021-02-08 01:02:00 (-08:00)

Reproduction Steps:

  1. Download repro model DuplicateNamesRig.rbxm (3.4 KB)
  2. Bring it into Studio
  3. Open Animation Editor
  4. Select DuplicateNamesRig
  5. Observe that it throws an error referring to multiple parts sharing the same name, where there are none

Expected Behavior:
I expect the Animation Editor to allow me to select the rig without throwing a name collision error.

Actual Behavior:
The Animation Editor throws a name collision error.

Workaround:
Renaming the HumanoidRootPart bone silences the error. This also breaks the rig.

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