I just found out about this (idk how long this bug has been in the game since I don't play Bedrock that often) when I went to go dig down, and placed a torch on the wall next to me and it just disappeared. Didn't reappear in my inventory, didn't drop, didn't even keep lighting, it just vanished.
MCPE-187540
Torches disappear from existence if placed in a block space I'm occupying
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1
Same thing happened to my sister in my world but every torch disappeared in the mine staircase it must be a bug