When any of the mob heads are placed in flowing water, it appears to stop the water from flowing for a slight second.
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Thank you for your report!
However, this issue has been closed as Working as Intended.
This behavior is consistent between Bedrock Edition and Java Edition.
Also, if a head is pushed by a piston or comes in contact with water or lava, it breaks off as an item.
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...That... makes sense.
I think that's not a bug...
What did you expect it to do?