Fix fence registration

init.lua

@@ -895,7 +895,7 @@ local head_sounds = default.node_sound_wood_defaults({
 	dig = {name="riesenpilz_head", gain=0.2},
 	dug = {name="riesenpilz_stem", gain=0.1}
 })
-local add_fence = minetest.register_fence
+local add_fence = default.register_fence
 local node_groups = {oddly_breakable_by_hand=3, fall_damage_add_percent=-80, bouncy=10}
 
 for _,i in pairs({
@@ -1034,7 +1034,14 @@ for _,i in pairs({
 
 	if add_fence
 	and i.fence ~= false then
-		add_fence({fence_of = nodename})
+		add_fence(
+			nodename.."_fence",
+			{
+				material = nodename,
+				texture = textures[#textures],
+				groups = node_groups,
+				sounds = sounds,
+		})
 	end
 end