WORLDGUARD-3200 - Reported by Marooo

I have tried this with the latest 6.0 dev build and also with 5.9.1:

config.yml:

gameplay:
block-potions:
- INVISIBILITY
block-potions-overly-reliably: true

blacklist.txt:

[373:8206,373:8270,373:16398,373:16462]
ignore-groups=Admins,Mod,Supermod
on-place=deny,tell,notify
on-interact=deny,tell
on-break=deny,tell
on-acquire=deny,tell

with item ID

Invisibility Potions are blocked fine with these settings EXCEPT when somebody uses a dispenser to throw one out of it.
Please fix!