If a portal has been created that hasn't had an exit portal generated by the player yet, and an entity goes through it - first of all it creates a spike in MSPT by several hundred, (MC-152635 and MC-117914) - and the entity cannot travel through.
The problem starts when the player travels through and loads up an exit portal and then travels back again. When the SAME entity is pushed through the portal again it once again causes a lag spike but the entity will not go through, even though an exit portal has been generated. Other entities who have not been pushed through the portal before the exit portal has generated will be able to pass into the other dimension. I have waited the cooldown time, tried breaking the nether portal, and even re-logging but the offending entity will not pass through.
Comments 3
It can, but in a different way. There are now no longer any lag spikes. I have been testing the issue - first in 1.14 so I could remember how to recreate it, then in 1.16 release candidate 1 to check if it was still happening. The result was mixed, with some times working as it should, and other times the issue persisted just like the previous 1.14 bug. I found out this had to do with the gamemode you were in when you pulled the entity through for a second time. Pushing the entity through a portal without an exit portal linked, loading the nether and coming back to the overworld can be done in creative mode. If you then try to push the entity through for a second time with the exit portal now generated, it has to be done in survival mode for the entity to go through. However if you are in creative mode, the entity will not go through the portal, replicating the 1.14 bug, but without the lag spikes.
Does MC-151648 describe this issue?
Can this still be reproduced in 1.16 Release Candidate 1 or later?