The bug
Azalea and flowering azalea can be placed in water, but not waterlogged. May be a deliberate choice, but other nonaquatic plants get washed away for the most part, so this one remaining without becoming waterlogged is odd.
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is duplicated by 2
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In 1.20.5, Azalea bushes pop off if water attempts to flow into the block from the side; however, water is not able to flow in and break the block from the top.
This means that while an azalea bush can't remain on the bottom of a flat pond or similar, it can be placed in a one-block hole or have water flow on top of it on its way down a slope without breaking.
Can confirm