Return projectile changes

This question will probably need a Dev(and they are extra busy at the moment) cause no one else will know sadly.
With the new projectile return changes do projectiles ALWAYS come back?
So basically any return source is the same and if they do NOT always return what are the cases where they DO and DONT?
Thanks in advance for whoever might know the answer.

I understand that the projectiles that have a timed duration, like freezing pulse and spark, wont return. Probably it's the same for Tornado Shot also.