[.11] Poison Cache and Staff edge case?

DiscOH

Artisan
Poison Cache pg 37 v.11c said:
A weapon with a Poison Cache Ritual may have an additional Contact Poison applied
Staff pg 68 v1.3 said:
A staff has two edges for the purposes of Weapon Coatings

Does each level of poison cache grant 1 or 2 additional poison coating slots for a staff?
i.e. does poison cache increase the edge capacity by 1, or does it create a seperate edge?
 
It's under section 6.1 for Alchemy Changes:

"Staves no longer have an exception allowing them to handle multiple coatings at once."
 
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