To recreate this dig a deep pit, (for me the pit was 15x60x15) surround th pit with fences, (I used oak) Mine 3-5 blocks over the pit right next to the fence.
The drops from the stone blocks start to fall then glitch back up and continue this behavior until collected. Not sure if they eventually despawn
Related issues
duplicates
Comments

Thank you for your report!
We're tracking this issue in MCPE-105892, so this ticket is being resolved and linked 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.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
-- I am a bot. This action was performed automatically! Please report any issues in Discord or Reddit