When you go out past a certain amount of blocks, the rendering gets all glitchy, entities stop colliding with blocks, rendering only generates lava, water, bedrock, structures and kelp, field of view gets messed up and sometimes will crash.
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What are your coordinates when this issue happens?

At 12550821 and beyond

Thank you for your report!
We're tracking this issue in MCPE-102351, so this ticket is being resolved and linked as a duplicate.
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This is due Minecraft Bedrock code language C++ and at certain point the 32 bit floating point lost presicion and everything start to bug. Here in the wiki you can find more information about this problem.
And maybe this wont be fixed since is too technical and change world generation could cause a lot of problems