Zombie turnes into Drowned for no reason

A Baby Zombie with a Golden Helmet tried to attack me but after one hit it randomly converted to a Baby Drowned and dropped the Helmet the nearest water source was several blocks away. It didn't burn because we where under a tree and when i pushed it out of the shadow it burned. The Drowned didn't even attack me probably as part of this bug (MCPE-37006)

The version this happened was 1.16.40

I am really sorry for not state the correct version on the top but it would not let me pick any version other than the 1.16.201 Hotfix and the 1.16.210.53 Beta