Piglin Brute disappears upon conversion.

The Piglin Brutes when entering the overworld do not turn into a zombie as they should be.
https://drive.google.com/file/d/1D4KtcGgAefL16BXhM_-OruFeMhgz3TRV/view?usp=drivesdk
(That is the video that demonstrates it and I put it in drive since the page does not allow me to upload more than 10MB of video)