The default morph config gives the bat the hostile ability in the newest version (1.2-1.12.2_command-fixes). This could be intentional but I assume it isn't because of how ovepowered it makes the bat.
https://github.com/asanetargoss/Changeling/blob/changeling-master/src/main/resources/assets/metamorph/morphs.json

It's intentional.