Ok, but I ask, because "normally" I think you're supposed to connect to the Van before fighting Sasquatch (theoretically, she is on your path to the cinema).
So if you didn't try this order, you should
Anyway, if you didn't use mods and if it's not already done, you can report it to CDPR Support (with a save if you can).
In fact, you're supposed to be "discreet" until you reach the van, if you follow the Placide's instructions obviously. And indeed, you are not able to defeat Sasquatch discreetly, it's totally impossible (unlike of all the other Animals in the area)