Cannot undo deleting

For some reason, I can’t undo deleting parts. I can undo moving parts or changing parts, but the undo won’t bring back deleted parts. This is extremely frustrated and I’ve lost a lot of progress to this. How do I fix this?

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Are you using a keyboard command to undo changes? Try using the buttons instead, or vice versa (depending on what method you use). Sometimes I find that one method doesn’t work.