Guild Wars 2

I’m looking for confirmation and intention of superior sigil of momentum not being able to coexist with superior sigil of bloodlust. I have superior sigil of bloodlust on my first set’s mh weapon and superior sigil of momentum on my second set’s mh weapon. I’ve been killing mobs in the open world and in fractals trying to see if both stacking buffs can be present at the same time…so far only one of them will appear. Is this intended? Is it the same with superior sigil of perception if I also try to have it coexist with superior sigil of bloodlust? Is this because both are “on kill” effects…despite being on weapons that are not equipped at the same time?

This has always been the case for stacking sigil.