New stat "Arrow Speed" interaction with "Feathered fletching"

Hi, I posted about this in the discussion forums, however I was recommended to post about it here with some new information.

As a ranger I took the node "Feathered fletching" which makes increases and decreases to projectile speed count towards projectile damage. There's a quiver base type called "Volant quiver" which grants arrow speed, however this stat is not underlined so no additional information is related to this stat.

Does increased arrow speed count towards increased projectile speed, or is it unrelated?

While I can't be 100% sure, the projectile speed modifier on my poisonburst arrow does not change in it's damage breakdown menu when swapping to the Volant quiver, so I'm assuming that arrow speed does not relate to projectile speed.
(NEW INFORMATION SINCE PLAYING LAST) It is then interesting how the damage number does still go up somehow by around 150 in the damage breakdown menu when equipping a magic volant quiver that only has mana gained on kill mod on it. I've checked my build/p-tree for any dmg increases from mana but I have none, which just makes it all the more confusing since that maybe means that arrow speed does affect "feathered fletching" even though the breakdown menu shows no changes in attacks per second or projectile speed.

I really hope that someone can clear this up because I'm geniunely so confused lol.