Recurring indexed titles in array items for themes other than core

[Rozamo]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

mui

Version

5.15.1

Current Behavior

The indexed titles which are handed down from the array property to its children are recurring for non core themes. For example, in this playground, the title/label array-1 is being used at two places.

Expected Behavior

The indexed titles should not repeat, similar to how the core theme works.

Steps To Reproduce

1. Head to the playground example
2. Notice that array-1 title/label is being repeated for both the first and second index

Environment

- Chrome: 120.0.6099.71

Anything else?

This is happening after a recent #4002 PR. The indexed titles were taken care of for the core theme and are required for other themes as well.

[heath-freenome]

@Rozamo Can you fix the other themes? Thanks!

[heath-freenome]

@Rozamo I just tried your use case in the v6 playground and the issue seems fixed. Can you confirm and close?