There is a rare chance that when a wolf with wolf armor is killed it will drop 2 wolf armor instead.
MCPE-177560
Wolf armor duplicates when dropped.
Resolved
Fixed
4
(Unassigned)
1151582
Confirmed
Multiple
PC
1.20.60.23 Preview
1.20.60.24 Preview
Retrieved
I have this issue too, but from my minimal testing it seems to drop 2 around 50% of the time, but it doesn't seem to be specific to a specific tool/method of killing