[data grid] Activating an aggregate in the first row grouping demo breaks labels

[GabrielVooDB]

Steps to reproduce

Steps:

1. Open this link to live example: https://mui.com/x/react-data-grid/row-grouping/
2. Enable size aggregation on company
3. Remove size aggregation on company

Current behavior

The label value stays at 0 (which is itself strange).

Expected behavior

The value return correctly to the company name.

Context

We are trying to combine row grouping and aggregation and this issue was found. We then reproduced it in the demo.

Your environment

npx @mui/envinfo

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  Output from `npx @mui/envinfo` goes here.

Search keywords: Row grouping aggregate

Order ID: 100223

[MBilalShafi]

Thank you @GabrielVooDB for reporting the issue. I can reproduce it.
Moved to the board for team to take a look.

[cherniavskii]

The same issue is reproducible with other columns, not only grouping one.