Snow particles killed while outside but they ignore roof collision if I get inside in viewport

So I have a wierd problem with Snow particles - everything is working fine while I am outside the house, roof collision is killing falling particles just as I set in Particle settings ( roof collision is set as “block all”, particle settings is “kill”)
But as soon as I move inside the house in viewport it appears like particles start to ignore roof collision for some reason and they just start to fall inside the house.
Roof segments are just static meshes with collision applied in Unreal.

Pictures before and after - actual positions without and with this problem.

Anyone knows why this is happening?