I first noticed the issue in Pre-Release 2, but it might have been present in Pre-Release 1 already, certainly absent in 19w14b though: quite a few areas of the world have developed patches of darkness, sometimes visible on ground level, sometimes starting higher up, but invariably ending beyond the build height, often around y 275 (so 20 blocks above build height). In addition, some chunks have been corrupted and regenerated.
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Thank you for your report!
We're actually already tracking this issue at MC-142134, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
OK, MC-142134 is about the dark patches. But what about the regeneratign chunks? That reminds me of another issue that exited last year but was then resolved. Basically, some chunks that were fine in 19w14b, have now been completely regenerated.
Duplicate of MC-142134. Please use the search function before reporting.