"/clone ⋯⋯ masked move" leaves water at original location

The block(layer 0) will be moved.
But the water(layer 1) will be cloned(rather than moved) to the destination then(next tick) the residual water(layer 1) will become a new water block(layer 0).

Steps to reproduce:

1. /setblock ~ ~ ~ water
2. /setblock ~ ~ ~ seagrass
3. /clone ~ ~ ~ ~ ~ ~ ~2 ~ ~ masked move

Observed Results:

1. At ( ~+2, ~, ~), a waterlogged seagrass appears.
2. At ( ~, ~, ~), the water remains and can't be removed in the same tick. "/testforblock ~~~ air" shows that ( ~, ~, ~) is air, which is visually not. It's just the waterlog hasn't become a normal water block.
3. Next tick, ( ~, ~, ~) is a water block.

Expected Results:
( ~, ~, ~) should be completely empty after moving.