This causes breakage of the other block at the end. Typically mining another block would cause previous block progress to reset, but it doesn't happen with blocks that break instantly.
Linked issues
duplicates 1
Comments
violine1101
gnembon
Thank you for your report!
We're actually already tracking this issue in MC-157404, so I resolved and linked 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 in the future to see if the issue has already been reported.
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