I'm having the same issue on Minecraft PE Android version 1.12.1 (but also before the last update). I go from a secondary overworld portal to my nether portal, and it works fine. But if I then immediately go back through the nether portal to get to my main overworld portal, it gets stuck on "building terrain". I'm forced to close and restart the app, after which I will respawn outside ten blocks above my main overworld portal. Anyway here's a link to my world, let me know if there's anything missing: https://drive.google.com/folderview?id=13L1cA_JSddszwXxj_aPQA5UdzXkSOZ98
Gwen Wilson
I'm having the same issue on Minecraft PE Android version 1.12.1 (but also before the last update). I go from a secondary overworld portal to my nether portal, and it works fine. But if I then immediately go back through the nether portal to get to my main overworld portal, it gets stuck on "building terrain". I'm forced to close and restart the app, after which I will respawn outside ten blocks above my main overworld portal. Anyway here's a link to my world, let me know if there's anything missing:
https://drive.google.com/folderview?id=13L1cA_JSddszwXxj_aPQA5UdzXkSOZ98