if you put water flowing into a wet sponge and replace the wet sponge with a dry one using /setblock then the new sponge will not absorb the water.
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Cannot confirm.
Confirmed, didn't follow directions correctly.

Setblock doesn't do a block update. It's similar to melting ice with a torch. You'll need to add destroy to force the block update
/setblock ~ ~ ~ sponge 0 destroy

But setblock does cause a block update. If do setblock water twice next to each other the water starts to flow

That works because the second sponge creates the block update for the first one