1.16.4

Describe the bug
Hi, I saw a problem with command //replecace beacuse every time when i want to change block with % (//repleace stone 20%stone_brick) the problem shows up and i don't know how to do it right :(

Screenshots
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Please read the note here: https://worldedit.enginehub.org/en/latest/usage/general/patterns/#random-pattern

Use "%20 stone_bricks" as your mask instead.