Manual spawn positioning in custom mapgen

mods/mapgen/init.lua

@@ -25,6 +25,20 @@ if minetest.get_mapgen_params().mgname == "singlenode" then
 		vm:set_data(nodes)
 		vm:write_to_map()
 	end)
+	
+	-- see https://github.com/minetest/minetest/issues/12782
+	if not minetest.settings:get("static_spawnpoint") then
+		local spawnpos = vector.new(0, ground_level+1, 0)
+		minetest.register_on_joinplayer(function(player, lastlogin)
+			if not lastlogin then
+				player:set_pos(spawnpos)
+			end
+		end)
+		minetest.register_on_respawnplayer(function(player)
+			player:set_pos(spawnpos)
+			return true
+		end)
+	end
 else
 	-- FIXME: Why dosen't node_top work properly?
 	minetest.register_biome({