The bug
If a warden gets angry at a zombie, and said zombie transforms into a drowned before the warden can kill it, the warden will not remain angry at this drowned and will need to become aggressive toward it a second time.
How to reproduce
I don't know of a good setup to reproduce this in consistently. Zombies take around 46 seconds to transform once submerged, so summoning a warden in at the 25 second mark is probably best.
Expected results
The warden would remain angry even when the targeted zombie becomes a drowned.
Actual results
It loses its target.
Thank you for your report!
We're tracking this issue in MC-265066, 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