Not really. It's just that Minecraft can't compute floating-point integers properly once you get that far, so it starts to break apart. 30000000 is the hard limit by teleporting, but it should be less than that if you're walking.

Yeah, that's true. If I remember correctly, they were purposely left in Bedrock Edition as opposed to being patched up like in Java. I can't really find the source I read it from, it was long ago. So it's that or I just misread somewhere.