In the image, you will see the mini pet doing 297 and the commander pet doing 268.
Then in white you see my dex buff for the pets
Then after buffs you see mini pet doing the same 297 damage, but the main commander pet increases to 317 damage.
Hasten buff is supposed to benefit all pets not just the commander, as you can see in the white text it buffed all but only affected the main pet not the archer sub pet.
Now on the flip side, i did a test with the melee pets
As you can see in this image, main pet 208 mini pet 171 pre-buff
White text apply the strcon pack buff, you can see it applied.
Now after buff, main pet does 241 and mini pet does 198. Both damage increased correctly.
So the issue is only with the archer mini pet not gaining damage by dex buff.
Thank you