The bug
In 1.16.2, Java Edition updated portal mechanics with two major new features:
The search radius is now proportional to the dimension scale factor, meaning portals will only search a range of 16 blocks in the nether, compared to 128 in the overworld
Portals use the POI system to cache links, meaning two portals that are linked will stay linked until one of the portals is destroyed
These changes were not ported to Bedrock Edition, meaning the confusing behavior described in MCPE-39609 still persists.
More information about this change can be found in MC-197538
Related issues
is duplicated by
MCPE-151171
[Parity?] Overworld portals links to wrong Nether portals
MCPE-151851
Nether portal does not return to original in overworld but creates new
MCPE-154548
misbehaving nether portals
MCPE-157464
Nether Portal leads to a different location in the Overworld when exiting the Nether
MCPE-159900
Nether portals in Overworld all connect to same portal in Nether
MCPE-160038
Nether Portal not sending us back to original portal
MCPE-165336
Nether Portals Sync When far Away from Each Other
MCPE-179337
Nezer's portals are not working correctly.
MCPE-181106
Nether portal teleporting back to over world in a different location.
MCPE-184903
Nether portals
MCPE-184985
Nether Portal Glitch
REALMS-11047
Nether portal doesn’t work right
MCPE-190879
After making the nether portal is duplicates after entering the overworld again
MCPE-220991
Nether portal creating random overworld portal underground upon exiting the nether.
Comments
DeeFeeCee
migrated
affects 1.20.30
X1Crafts
This is also related to MCPE-47288, which highlights the missing portal mechanic that was recently fixed for Java at MC-67.
tryashtar
Affects 1.19.22
Relates to MCPE-154548