When you break any block, you will see black dropped block for very short time.
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Thank you for your report!
We're tracking this issue in MC-167359, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
However, this issue is a Duplicate of MC-166768.
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.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki