(This has been fixed on JAVA = https://bugs.mojang.com/browse/MC/issues/MC-180 in 1.20 pre-release)
The Bug
When you reach the other side of a nether portal, the animation plays forever until you step out of it, even in creative. The animation is completely unnecessary here. This also causes motion sickness in many people.
How to reproduce
Build a nether portal
Enter it
Stay in the exit portal
The animation will start playing when it shouldn't
Thank you for your report!
We're tracking this issue at MCPE-118635, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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