2nd passive tree interaction with delayed damage in weapon switch

Say I play as mercenary and have invested in 2 trees:

Tree 1: focus on grenade damage

Tree 2: focus on bolt damage

Now I bind skills on two different weapons, which corresponding to tree 1 and 2

Weapon 1 (Tree 1): link to gas grenade

Weapon 2 (Tree 2): link to explosive shot

In action I throw the grenades using Weapon 1 and switch to Weapon 2 to fire explosive shot for detonation. So what will be the situation:

Does the gas grenade take all the benefits from Tree 1 (grenade focused) because it has been thrown out? Or,

Does the gas grenade loses all the damage traits from Tree 1 because I have switched to Tree 2 for bolt detonation?

I guess it all comes down to when the damage multipliers are being allocated for calculation?

Based on how weapon stats are remembered I'd guess your Passive Skills are also remembered.
I'm using Lightning Rod with Weapon Set I and Lightning Arrow with a Quill Rain Bow to proc it fast in Weapon Set II. Quill Rain has very low damage, something like 7-9, but Lightning Rod's bursts still deal damage as if I had my Bow in Weapon Set I equipped.

So I think for delayed Skills the only thing that matters are your stats in the moment of using the Skill, but this is only a guess.

Might be worthwhile to test this in more detail, maybe with summon skills it is easier to see.