This explains it all:
Do you know what you were doing when that happened?
I was just coding and I clicked the undo button and that happened.
can you replicate what you did to make it happen?
I don't understand.
That is not at all normal. The undo button is weird normally.
yeah, but I've never seen this happen before
Well it could be a new bug.
I cannot reproduce this doing what you say you did. Frankly, this looks like you've switched to dev mode to take those blocks apart.
it didn't worked as you did it.