Can confirm this.
The attributes do not work, when the mob is summoned and it drops its sword, the sword lacks any sort of attributes assigned to it.
I have done some testing and as it turns out, it isn't the scoreboard working, but an error in my commands. I constantly set the 9th slot of my inventory to the potion not realizing that bugs it out. Apologies for the inconvenience.
Can confirm this. Oddly enough, crouch_one_cm works as opposed to sprinting and walking.