Wither attacks wither skeleton and stray

This happened to me too

Device: Xiaomi Redmi 1S

Noticed this too. Checking the json files The Wither Boss is set to not attack "undead" family, but Wither Skeletons and Strays are not set as members of "undead" family (only themself and "monster")

Wither Skeleton:
"minecraft:type_family": {
"family": [ "wither", "monster" ]
}

Stray:
"minecraft:type_family": {
"family": [ "stray", "monster" ]
}

Confirmed on a Samsung Galaxy Tab A running 0.16.0

Fixed in 0.17.0.1. (But I have to mark it as fixed in 0.17.0.2 because I can't mark an issue as fixed in an archived version. 😛)