Random chunks get regenerated
The world was fine in 19w14b (and posibly 1.14 Pre-Release 1 but not sure about that), but in Pre-Release 2, random chunks have been regenerated (completely replaced with new terrain). screenshot is attached. 
2019-04-13, 08:16 PM
2019-04-14, 04:47 AM
2019-04-14, 04:46 AM
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