Hey!
I've found bug when replacing magma block with soul sand and vice versa, with command /setblock.
Magma block under water does "bubble column" wich pulls you down. Soul sand under water does "bubble column" wich pushs you up. When you replace magma block with soulsand using command, then the "bubble columm" still pulls you down.
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duplicates 1
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When /setblock is used, the blocks are not updated (see MC-129367)
Confirmed for MC 1.13-pre2.
I also tried to reproduce this bug replacing the block manually, but it works. This only happens if you replace the block with the command
Probably because the block does not "regenerate" and the game still detects a magma block.