When guardians flown by water fall from the edge of blocks, they doesn't fall straightly.
Yes, they can fly.
The video is too large, so I uploaded the other site 'niconico video'.
Check the scene from 00:10. You can see the flying guardian.
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[Mojang] Mega_Spud (Jay)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-33641.
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