Slate cobblestone

block survival:cobblestone-slate · from game

Produced by (1)

Filters

Recipe	Category	Ingredients → output
grid recipe	grid	clay-* + Slate stone → Slate cobblestone ×2

Found in structures (3)

Structure	Kind
sunrift	storystructure
megastructures-palaceofnestor-nybygget	structure
largeruins-0605-sirayne-o7	structure

This confirms the schematic(s) contain this code somewhere, not where or how many times -- the per-instance block-entity decoding used for tapestries isn't run for every content type.