This picture says it all. It just started after I launched the game for the first time in months. And then baa-da bing baa-da boom stuff just broke all 9-year olds first Tf2 map style.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-31585.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
As a workaround, lowering your anti aliasing setting should resolve this issue for you.
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There was at least one version where you were supposed to load all your old worlds to get them updated to the new world save format. Since it has been months as you said, these worlds may be corrupted due to being incompatile with the current version.
Also, using a beta version is bound to cause things to break. (I don't think 1.5 as a stable version yet)