When i go through a nether portal from the over world it either won't generate a portal if there isn't one and I fall towards the lava lake below me, or it brings me through the portal but I spawn in the nether below the portal and fall. Old portals seem to be working unless they are in a area that was reset for the update and have to be regenerated in the nether, but haven't tested them all yet.
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We're tracking this issue in MCPE-84937, so this ticket is being resolved and linked as a duplicate.
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