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Bug
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Resolution: Invalid
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None
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1.13.0.1 Beta
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None
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Unconfirmed
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Windows
Worlds created in 1.12 that have add-ons with custom blocks crash Minecraft on load.
Creating a new world in 1.13 and adding the same add-on as the 1.12 world works as expected with no crash.
I've attached an example world and add-on.