User blog:Biap01161/Petrified Saplings won't work on the Culture Vat

I don't know if this is a common problem in the new update but whenever I place petrified saplings( Calamites & Palaeoraphe) on the culture vat but for some reason they don't work. I tried different organics aside from milk but none of them seem to work. Can anyone help me fix this problem?