PR #22716 with fix of bug #21166 has not been merged in v4

[ivan-freedomfi]

Duplicates

• Fixed issues in v5, but not in v4: How to correctly extend Material-UI component with typescript #21166 and [Tabs] Issues with onChange TypeScript types #17454
• Might be related issue open issue: [material-ui][docs] Document the correct way to extend a component #19461

Current behavior 😯

The commit with the fix of the issues mentioned was released only in v5.x releases: 4f21dfc

No `v4` releases above for this PR.

You can see it's present inv5.0.0-alpha.11 changelog:

[core] Replace ChangeEvent<{}> with SyntheticEvent (#22716) @eps1lon

But the fix is not in v4 releases

It fixes issues #21166 and #17454

Are you going to merge this PR back in v4?

Steps to Reproduce

See CodeSandBox with the issue reproduced (Material v4.12.4): https://codesandbox.io/s/material-demo-forked-hlqon3?file=/demo.tsx

[eps1lon]

We only backport critical fixes to v4. A type-related change is not critical.