Nether Portal Bug

Nether portal created in over world (example: (7280, ~ ~, -1056)) takes player to same coordinates (7280, ~~ , -1056) in Nether. Generated Nether portal is then invisible until each block is interacted with. When leaving Nether via newly generated portal coordinates are then multiplied as normal. But existing portals then take play to coordinates matching that of the portal Nether side, reverse of the opening example. Tested since update 2.22 and at least two portals are working correctly at present