Bloodsoaked banner, does it scale with support gems? Or Phys damage from tree and clusters?

I am trying to figure out how to improve the damage of bloodsoaked banner.

To start with i unsocketed all support gem, so its just defiance banner+bloodsoaked banner gems in the link.

It seems to do exactly the same damage as with other supports brutality, swift affliction, efficacy, less duration etc.

So as I think right now. Blooadsoaked Banner does not get supported by gems. It keeps its damage as is.

Has anyone done testing of that as well? Is this intended? Or am I making a mistake?

- Edit - removed the cluster jewels with physical damage, the jewels with damage over time mult, and they too seems to have no effect on the damage of the bloodsoaked banner.

It modifies how the banner works, so any support on the banner like dot support damage should work. Also, if any increased physical damage has no effect on the damage, there is something very wrong.

Check if you don't have something in your build that bricks this interaction