How to reproduce
Put a water source
Place coral blocks under water
Plant a sea pickle in the water source
Use bone meals to sea pickle
→ ❌ Increased sea pickles changes water source from flowing water
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Confirmed in 19w08b
@unknown, no need to comment for affects version when you can add it yourself on your own reports.
Was able to re-create this in Minecraft 19w14b.

affects 20w29a

In 1.16.1
Can confirm in 20w49a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 1.19.
Can confirm in 1.19.2.

Can confirm in 1.19.4 and 23w17a
We were trying to create a redstone-powered sea pickle farm, and this bug prevents it from working.
I'm not sure what the expected behavior is here, but the farm would have worked if the sea pickles multiply onto neighboring coral blocks (with neighboring flowing water), but then the flowing water immediately causes the newly-created sea pickles to "wash away".