bug
link in photo
https://yadi.sk/i/HNHdfwOP3YPg8o

ask author of mod that adds quicksilver-stone split to check his technology dependencies.

yes
https://mods.factorio.com/mod/Dp77s-FactorioPlus-Plates

Search "quicksilver-Stone split" (4 hits in 4 files)
\Dp77s-FactorioPlus-Plates_2.7.0\prototypes\Dp77s-FactorioPlus-Plates_2.6.0\prototypes\recipe.lua (1 hit)
Line 914: --Quicksilver-stone Split:
\Dp77s-FactorioPlus-Plates_2.7.0\prototypes\Dp77s-FactorioPlus-Plates_2.6.0\prototypes\technology.lua (1 hit)
Line 1083: --Quicksilver-Stone Split:
\Dp77s-FactorioPlus-Plates_2.7.0\prototypes\recipe.lua (1 hit)
Line 914: --Quicksilver-stone Split:
\Dp77s-FactorioPlus-Plates_2.7.0\prototypes\technology.lua (1 hit)
Line 1083: --Quicksilver-Stone Split:

like i said, you need to ask mod author to fix that, not sure why he decided to hide steel production behind something, that requires green science for research, but t2 lab requires steel for components.