[2022] Shadows are broken after trying to save a block selection

After today's update, I discovered a strange shadow bug.
It happens after hitting the save icon when selecting blocks with the copy/paste tool. You don't have to save the macroblock to make this bug appear. After the preview screen of the selection is shown, the shadows are really weird and broken. This effect then persists even through maps until the game is restarted.

I have recorded a video that shows how to reproduce this:

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Thanks a lot for your time!