Extra Effects on attacks that do 0 damage?

[Tim Schneider 908]

Had a question come up in a game I was running around whether the additional effect on a Strike action (e.g. Poison/Disease/Grab) can apply if the attack deals 0 damage... I found in the core rulebook that if they're immune to the damage any other effects won't apply, but what if it's 0 damage another way? Such as:

1) The attacker just does 0, like a viper at d8-3 can easily do 0 damage.
2) The target has a Resistance that reduces the damage to 0.
3) The target raises their shield, and the hardness absorbs all the damage.

In these cases, is the target affected by a poison (Like a viper), a disease (Like ghoul fever), or other abilities associated with the Strike (Like ghoul paralysis)?

In researching this I found that for an Alchemical Poison of type Injury you have to be actually damaged by a Slashing or Piercing weapon to deliver it, but no such text occurs in the Bestiary Poison ability. Couldn't find anything useful to define "exposure" for a disease. Grab & the like seemed pretty clear in that it just needed a successful strike.

I'm currently assuming they apply regardless... but it does seem weird if you block the whole attack with a shield to still get poisoned.

[Ascalaphus]

Would be good to get some guidance on this. In PF1 I've always had to use judgement calls. Clearly for injury poisons it wasn't right for poisoning to happen if you don't do damage, but what about contact poisons?

Some abilities that reduce damage say they absorb the blow, or heal you so fast the damage doesn't stick; others that they basically prevent the blow from connecting. And some of the rider effects seem to require injury and some just contact.

As a general principle I'd say that "injury" rider effects only happen at 1+ damage, but "contact" rider effects always happen unless the thing that reduces damage says that it deflects or avoids the hit.