Bow mastery and projectile mastery doesn't stack

If you get the Bow mastery which makes increase and reduction to projectile speed also apply to damage, it increase your damage with all the increased projectile speed you have, however, if you go select the projectile mastery and select the mastery which gives you 15% more projectile speed, it doesn't affect the damage you gain and in fact, it does increase your projectile speed but the increase isn't applied to your damage from this mastery, if I have 110% increase projectile speed I am getting 110% increase damage, with the 15% more projectile speed mastery I now have 142% increase projectile speed, but my damage hasn't been increased from this mastery, it remains the same even with the 15% more, the 32% extra projectile speed isn't applied to my damage.

Bug or intended?

more != (increased OR reduced)

wow ok, so more or less won't affect it since it's only increase/reduction?

Yep it's exact, the wording are important :

- X% Increased to X type damage : Only take %Increased value (ex: Brands with casting speed, More casting speed doesn't work)
- X% More to X type damage : Only take %More value (I don't think it exists but I might be wrong)
- X% Modifiers to X type damage : Take both %More and %Increased (ex: Fire Trap Gem)

thank you