Azalea (plant) can be placed on dirt that's underwater. Azalea breaks when in contact with water, so it doesn't make sense why it's possible to place azalea on a block thats underwater.
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I don't understand the problem, by the looks of the video it seems like you can't place azalea underwater.

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Can confirm that this happens in a vanilla environment.
I think this would be a duplicate ofย MC-213794, however, I'm not too sure.

I agree.