Toxicologist Field Discovery supported?

[12hourhalfday]

Is the toxicologist research field for Alchemist field discovery supported? I can't figure out how to get it to work. When prepping poisons after 5th level, I still only see 2 batches per reagent instead of 3 and I don't see any way to split them.

Edit: When I originally posted this I accidentally said after 1st level. That must have been what caused the confusion. I changed it to after 5th level.