In any world where the player has already built some structures (I couldn't recreate this issue in brand new worlds), trying to enter the Nether takes at least 25-30 seconds, regardless if it still needs to be generated, or if the player has returned to the overworld from it a few seconds earlier.
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Would MCPE-160998 describe your issue?
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It half-deacribes it, because on top of weird game behavior there's also the fact that it takes half a minute to load the Nether, whereas the overworld takes the usual 3-5 seconds... The issue you mentioned doesn't seem to have the same problem with loading times

It half-deacribes it, because on top of weird game behavior there's also the fact that it takes half a minute to load the Nether, whereas the overworld takes the usual 3-5 seconds... The issue you mentioned doesn't seem to have the same problem with loading times
Updated the report to exclude information covered in MCPE-42310 and MCPE-160998.
Can you please attach the affected world?

Done, it happens on multiple worlds and devices but I attached the survival world where I first noticed the bug, hope it helps

Done, it happens on multiple worlds and devices but I attached the survival world where I first noticed the bug, hope it helps
The Nether in the world you attached only took around 8-9 seconds to load, perhaps this is a device-specific issue?
Edit: This seems to affect Android devices more than it does Windows ones.

Yes It does apparently only affect Android, tried different devices from different brands (Samsung, Motorola etc...) and they all had this same issue. Sorry for not clarifying earlier

Yes It does apparently only affect Android, tried different devices from different brands (Samsung, Motorola etc...) and they all had this same issue. Sorry for not clarifying earlier

I'd like to upvote and say that we're having the same issue on BDS.
We have two separate BDS servers (test and live) on Apex, testing in Vanilla, Experimental Vanilla, and Experimental Modded, and we have issues with portalling into the nether taking 3-5 minutes.

I'd like to upvote and say that we're having the same issue on BDS.
We have two separate BDS servers (test and live) on Apex, testing in Vanilla, Experimental Vanilla, and Experimental Modded, and we have issues with portalling into the nether taking 3-5 minutes.

Updated to 1.21.2 and can confirm this bug is still happening

Updated to 1.21.2 and can confirm this bug is still happening

This also happens to me on Nintendo Switch.

Also interesting to note that this issue is also present on an Xbox One X.