The bug
If you shear a mooshroom with shears, the resulting cow will spawn facing south instead of the direction the original mooshroom was looking in.
Linked issues
Attachments
Comments

Relates to MC-94093

Confirmed for 16w39a.
confirmed in 18w11a.

the cow is a new entity with the mooshrooms properties, but the direction it's facing isn't one of them, so probably wai (as it is on console, see MCCE-2475
Confirmed for 1.10.