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As the original Copyright holder, you can do that. It just doesn't make the old Apache licensed version disappear.

Only if they do hold all the copyrights. If they've removed the notices from other people's open-source contributions (and don't have a CLA or similar that permits them to do so) then that's copyright infringement.

I thought the MIT license was the original one?

It was Apache2, see this (preserved) fork.

https://github.com/Dramaga11/vsc-material-theme/blob/main/LI...

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