Someone once told me...."Each shot is its own phenominon".
You'll never get the exact same result shot after shot.
I can't say I have ever bent a crossbow bolt cuz of impact on a deer. Truth be told I can't remember ever not having a pass through.
Back in my vertical days I had a few arrows bend from deer rolling on them or hitting brush as they ran after the shot.
Could an arrow or bolt bend due to impact?....I don't know, maybe?.....But I sure as heck wouldn't lose sleep over it if the deer tipped over in the end.....