what the hell! big chunk in middle of my house

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this also happened to me, after a power outage in middle of playing, i went back into minecraft since it turned off my ps4 then i went into a survival world and saw empty chunks, i ignored them at first and then went to see if they were unloaded and i fell right through into the void. i was playing with someone else since it was their world. so when i left and rejoined, the chunks appered again for no reason. my wifi was bad at that time so im not sure if it was my wifi, minecraft, or my ps4