For what it's worth, here's the extended trailer for "La Luna Sangre"
https://youtu.be/kILvkHAYp98.
There is a half-second scene where two people turn into wolves and burst out of their clothes, but it's shot from quite a distance so we don't see much detail at all. (Plus they look like dudes not females.)
The premiere date has been pushed back to 19 June.