tweak sandstone/sand recipes to a more efficent compressing 2 sand -> sandstone and grinding sandstone -> 2 sand ratio; make sure the default recipes are defused

technic/machines/register/compressor_recipes.lua

@@ -10,7 +10,7 @@ end
 
 local recipes = {
 	{"default:snowblock",          "default:ice"},
-	{"default:sand 4",             "default:sandstone"},
+	{"default:sand 2",             "default:sandstone"},
 	{"default:desert_sand",        "default:desert_stone"},
 	{"technic:mixed_metal_ingot",  "technic:composite_plate"},
 	{"default:copper_ingot 5",     "technic:copper_plate"},

technic/machines/register/grinder_recipes.lua

@@ -23,8 +23,17 @@ local recipes = {
 	{"default:cobble",          "default:gravel"},
 	{"default:gravel",          "default:dirt"},
 	{"default:stone",           "default:sand"},
+	{"default:sandstone",       "default:sand 2"}, -- reverse recipe can be found in the compressor
 }
 
+-- defuse the sandstone -> 4 sand recipe to avoid infinite sand bugs (also consult the inverse compressor recipe)
+minetest.register_craft({
+	output = "default:sandstone",
+	recipe = {
+		{'default:sandstone'}
+	},
+})
+
 if minetest.get_modpath("farming") then
 	table.insert(recipes, {"farming:seed_wheat",   "farming:flour 1"})
 end