Im not sure if this apply's to 1.16.220 because it just came out but sometime's when you go through a nether portal it will put your overworld coords in the nether and your portal will disappear and to make it reappear you have to do a block update this is also used to get to the far lands
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We're tracking this issue in MCPE-115933, so this ticket is being resolved and linked as a duplicate.
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