There is something (i suspect a mod) that changes the wood plank recipe (tree seeding), so it doesn`t show up. To fix it, open the mod zip, and find the prototypes folder. Inside, open the technology.lua, find the aop_lumber_mill and change it from 50 planks to 50 iron-plate (or something for you balance. Since im doing a green run, the lumber mill early doesnt brake my balance. I will post the issue on the github too.
Thank you, mod author for your mod. I personally loved the changes, and it makes late game more fun with a variety of (not so hard, but not so easy) recipes. A top tier mod for me. A simple fix would be to just let the planks be crafted after discovering gleba, or in nauvis.