Supporting fire bug with Sceptres or main weapon (and prescence)

hi! I've been using supporting fire mastery from the tactician and i've noticed that any modifiers on the weapon does not work properly

For example i had a +2 level of all minion on my sceptre and it would only increase it's level and mana cost without giving more damage

The levels from an helmet works properly so i was wondering if it is intended that the weapon doesnt work or not


For the prescence I was only wondering if it's normal that no ''allies in your prescence have x'' modifiers works since there is no minions on the screen. it would make sense since its supporting fire but some clearance would be appreciated, thanks!