Red ceramic tile (plain)

block survival:tile-2x2-plain-red · from game

Produced by (1)

Filters

Recipe	Category	Ingredients → output
grid recipe	grid	Mortar + claytile-fired-plain-{color} → `tile-2x2-plain-{color}` ×4

Found in structures (2)

Structure	Kind
Trader camps in shallow bodies of water or swamp	structure
megastructures-palaceofnestor-nybygget	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.