Hardcoded filter (not smart filter) censors certain things in command blocks, inconsistently. Eg: "/fill -93 200 192 -293 111 203 air" will turn the ENTIRE text into "#############################" when the command block is exited, thus breaking the command block.
Linked issues
Comments 2
Duplicate of MCPE-106296
TheRoyalBlock
Duplicate of MCPE-106296