Theres quite a few haste potion bugs right now.
Trying to turn them into splash potions instead makes splash uncraftable potions.
if you use rohana powder instead of glowstone to make haste 2, it will only turn one of the three potions into haste 2. I've tried with 1, 2, and 3 potions at the same time.
The potion is also infinitely grindable like how star compass was before