When I teleport to x=30000000 and z=30000000 the world blocks are 1 grid apart. The player as well as other mobs cannot move. The blocks become cuboids and cannot be targeted. When the player is on the third-person camera, it jumps by about 250 pixels. Edit: The player can only move with fireworks-powered elytra.
This is currently all I know of this bug.
Regards to the creators of Minecraft.
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We're tracking this issue in MCPE-11418, so this ticket is being resolved and linked as a duplicate.
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