If you complete the secret route with 0 milk you can't advanced. X2 says she can't do anything with the milker at the command centre, and despite saying "let's see what I'm working with here" at the machine in the research lab nothing actually happens. (Note I have 3 milk undrunk in my inventory)
EXCEPT! I went and tested this more and guess what? Skipping the "Secret Scene" "featuring" the two antogonists GOT THE SEQUENCE TO WORK PROPERLY! (Assuming Unstable Compound is "correctly")
Additional Notes:
Works fine when drinking 1 milk and 3 milk... I think? And it sort of works fine on the 2 milk version.
See here's the thing. Both the 2 and the 3 milk version gets you the "moderate compound" ending despite the fact that when using just 2 milk on the Divide route you get Unstable Compound like the 1 and 0 milk routes
Let me know if you want more testing done or infomation on this one... not sure what else to test and I'm super lost tbh.