the drowned when they are swimming and approaching the player, they keep turning in a single block

Thank you for your report!
However, this issue is a Duplicate of MCPE-45645.

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