Use the codermobs texture naming, not the animal_materials_ prefix nor the _meat substring (related to issue #537).

Bucket_Game-branches/distinguish_meats-vs-211114a/mods/codermobs/codermobs/animal_materials.lua

@@ -184,7 +184,7 @@ minetest.register_craftitem(":animal_materials:meat_toxic", {
 
 minetest.register_craftitem(":animal_materials:meat_ostrich", {
     description = S("Raw Ostrich"),
-    image = "animal_materials_ostrich_meat_raw.png",
+    image = "codermobs_ostrich_raw.png",
     on_use = minetest.item_eat(3),
     groups = { food_meat_raw = 1, meat=1, eatable=1 },
     stack_max=5

Bucket_Game-branches/distinguish_meats-vs-211114a/mods/codermobs/codermobs/ostrich.lua

@@ -63,8 +63,7 @@ local msname_raw            = mcname           .. "_raw"
 
 local msname_img            = mcname           .. ".png"
 local msname_cooked_img     = msname_cooked    .. ".png"
--- local msname_raw_img        = msname_raw       .. ".png"
-local msname_raw_img        = "animal_materials_ostrich_meat_raw.png"
+local msname_raw_img        = msname_raw       .. ".png"
 
 local msname_egg            = mcname           .. "_egg"
 local msname_egg_fried      = msname_egg       .. "_fried"