This might be intended, but randomTickSpeed affects water just barely and water will still move when randomTickSpeed is set to 0.
In other words water sometimes flows too fast.
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mrpingouin1
MC-107354
Water reacts to randomTickSpeed with inconsistencies, and rarely flows too fast.
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mrpingouin1
(Unassigned)
Unconfirmed
Minecraft 16w38a
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That's intended. Water move on his own because a block update, the randomTick is just here to add a little chance of flowing faster so that it looks more natural.