When I use the portal, he should teleport me to nether.But it caused the game to crash while building terrain.And my attempt to use other portals to enter hell will cause the game to crash during building terrian.

1.I once built a 2x3 portal(-545,72,300 to -545,68,303).
I ignite on the obsidian
I used it to enter hell and explore.

2.Then I built a 20x20 nether portal(-533,92,291 to -533,73,312).
I ignite on the obsidian
I try to enter nether but the game crashes while building terrain.

3.I built other portals and tried to enter nether, but they all crashed when building terrian.

What should i do to enter nether?