The bug
When I put water in the water flow that's going down, then the source of water that I placed is replaced by the flowing water.
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The Targeted Fluid of a water block is changed to flowing_water and falling to true if a player places a water block on top of it. Easy to recreate by making a 3 tall column of blocks and placing 3 water against it from the floor up. then remove the top water block and all of the water is deleted.

How do you fix this in 1.16?
This still occurs in 1.13-pre1