diff --git a/mods/CORE/mcl_init/init.lua b/mods/CORE/mcl_init/init.lua
index a1346f50b..ebbfd5591 100644
--- a/mods/CORE/mcl_init/init.lua
+++ b/mods/CORE/mcl_init/init.lua
@@ -25,6 +25,7 @@ mcl_vars.inventory_header = ""
 local mg_name = minetest.get_mapgen_setting("mg_name")
 local minecraft_height_limit = 256
 local superflat = mg_name == "flat" and minetest.get_mapgen_setting("mcl_superflat_classic") == "true"
+local singlenode = mg_name == "singlenode"
 
 -- Calculate mapgen_edge_min/mapgen_edge_max
 mcl_vars.chunksize = math.max(1, tonumber(minetest.get_mapgen_setting("chunksize")) or 5)
@@ -45,7 +46,7 @@ local numcmax = math.max(math.floor((mapgen_limit_max - ccfmax) / chunk_size_in_
 mcl_vars.mapgen_edge_min = central_chunk_min_pos - numcmin * chunk_size_in_nodes
 mcl_vars.mapgen_edge_max = central_chunk_max_pos + numcmax * chunk_size_in_nodes
 
-if not superflat then
+if not superflat and not singlenode then
 	-- Normal mode
 	--[[ Realm stacking (h is for height)
 	- Overworld (h>=256)
@@ -66,6 +67,14 @@ if not superflat then
 	mcl_vars.mg_lava = true
 	mcl_vars.mg_bedrock_is_rough = true
 
+elseif singlenode then
+	mcl_vars.mg_overworld_min = -66
+	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
+	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
+	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min
+	mcl_vars.mg_lava = false
+	mcl_vars.mg_lava_overworld_max = mcl_vars.mg_overworld_min
+	mcl_vars.mg_bedrock_is_rough = false
 else
 	-- Classic superflat
 	local ground = minetest.get_mapgen_setting("mgflat_ground_level")
@@ -128,3 +137,4 @@ minetest.craftitemdef_default.stack_max = 64
 
 -- Set random seed for all other mods (Remember to make sure no other mod calls this function)
 math.randomseed(os.time())
+
diff --git a/mods/CORE/mcl_util/init.lua b/mods/CORE/mcl_util/init.lua
index 7e8513365..6c63c21ab 100644
--- a/mods/CORE/mcl_util/init.lua
+++ b/mods/CORE/mcl_util/init.lua
@@ -395,4 +395,13 @@ function mcl_util.generate_on_place_plant_function(condition)
 	end
 end
 
-
+-- adjust the y level of an object to the center of its collisionbox
+-- used to get the origin position of entity explosions
+function mcl_util.get_object_center(obj)
+	local collisionbox = obj:get_properties().collisionbox
+	local pos = obj:get_pos()
+	local ymin = collisionbox[2]
+	local ymax = collisionbox[5]
+	pos.y = pos.y + (ymax - ymin) / 2.0
+	return pos
+end
diff --git a/mods/ENTITIES/mcl_mobs/api.lua b/mods/ENTITIES/mcl_mobs/api.lua
index 821dbc0e9..33e049a89 100644
--- a/mods/ENTITIES/mcl_mobs/api.lua
+++ b/mods/ENTITIES/mcl_mobs/api.lua
@@ -2258,7 +2258,6 @@ local dogswitch = function(self, dtime)
 	return self.dogshoot_switch
 end
 
-
 -- execute current state (stand, walk, run, attacks)
 -- returns true if mob has died
 local do_states = function(self, dtime)
@@ -2550,7 +2549,7 @@ local do_states = function(self, dtime)
 
 					if mod_explosions then
 					if mobs_griefing and not minetest.is_protected(pos, "") then
-						mcl_explosions.explode(self.object:get_pos(), self.explosion_strength, { drop_chance = 1.0 }, self.object)
+						mcl_explosions.explode(mcl_util.get_object_center(self.object), self.explosion_strength, { drop_chance = 1.0 }, self.object)
 					else
 						minetest.sound_play(self.sounds.explode, {
 							pos = pos,
diff --git a/mods/ENTITIES/mobs_mc/creeper.lua b/mods/ENTITIES/mobs_mc/creeper.lua
index 2beffcf83..f1648525a 100644
--- a/mods/ENTITIES/mobs_mc/creeper.lua
+++ b/mods/ENTITIES/mobs_mc/creeper.lua
@@ -71,7 +71,7 @@ mobs:register_mob("mobs_mc:creeper", {
 		if self._forced_explosion_countdown_timer ~= nil then
 			self._forced_explosion_countdown_timer = self._forced_explosion_countdown_timer - dtime
 			if self._forced_explosion_countdown_timer <= 0 then
-				mobs:boom(self, self.object:get_pos(), self.explosion_strength)
+				mobs:boom(self, mcl_util.get_object_center(self.object), self.explosion_strength)
 				self.object:remove()
 			end
 		end
diff --git a/mods/ITEMS/mcl_flowers/init.lua b/mods/ITEMS/mcl_flowers/init.lua
index 42deede2f..af892bfa1 100644
--- a/mods/ITEMS/mcl_flowers/init.lua
+++ b/mods/ITEMS/mcl_flowers/init.lua
@@ -448,3 +448,34 @@ minetest.register_node("mcl_flowers:waterlily", {
 
 -- Legacy support
 minetest.register_alias("mcl_core:tallgrass", "mcl_flowers:tallgrass")
+
+-- mcimport support: re-adds missing double_plant tops in mcimported worlds.
+local mg_name = minetest.get_mapgen_setting("mg_name")
+local mod_mcimport = minetest.get_modpath("mcimport") ~= nil
+local fix_doubleplants = minetest.settings:get_bool("fix_doubleplants", true)
+
+
+	if mod_mcimport and mg_name == "singlenode" and fix_doubleplants == true then
+		local flowernames = { "peony", "rose_bush", "lilac", "sunflower", "double_fern", "double_grass" }
+		for c=1, 6 do
+			local flowername = flowernames[c]
+		end
+
+		minetest.register_lbm({
+			label = "Add double plant tops.",
+			name = "mcl_flowers:double_plant_topper",
+			run_at_every_load = true,
+			nodenames = { "mcl_flowers:peony", "mcl_flowers:rose_bush", "mcl_flowers:lilac", "mcl_flowers:sunflower", "mcl_flowers:double_fern", "mcl_flowers:double_grass" },
+			action = function(pos, node)
+				for c=1, 6 do
+					local flowername = flowernames[c]
+					local bottom = pos
+					local top = { x = bottom.x, y = bottom.y + 1, z = bottom.z }
+					if node.name == "mcl_flowers:"..flowername then
+						minetest.set_node(top, {name = "mcl_flowers:"..flowername.."_top"})
+					end
+				end
+			end,
+		})
+	end
+
diff --git a/mods/MAPGEN/mcl_dungeons/init.lua b/mods/MAPGEN/mcl_dungeons/init.lua
index e1218c0bc..1ce1556b2 100644
--- a/mods/MAPGEN/mcl_dungeons/init.lua
+++ b/mods/MAPGEN/mcl_dungeons/init.lua
@@ -8,6 +8,7 @@ if mcl_vars.mg_dungeons == false then
 	return
 end
 
+if mg_name ~= "singlenode" then
 -- Get loot for dungeon chests
 local get_loot = function()
 	local loottable = {
@@ -396,3 +397,4 @@ minetest.register_on_generated(function(minp, maxp)
 	end
 
 end)
+end
diff --git a/mods/MAPGEN/tsm_railcorridors/init.lua b/mods/MAPGEN/tsm_railcorridors/init.lua
index 3cc0d75da..f2e02d997 100644
--- a/mods/MAPGEN/tsm_railcorridors/init.lua
+++ b/mods/MAPGEN/tsm_railcorridors/init.lua
@@ -15,7 +15,11 @@ end
 -- Probability for every newly generated mapchunk to get corridors
 local probability_railcaves_in_mapchunk = P(0.33333)
 setting = tonumber(minetest.settings:get("tsm_railcorridors_probability_railcaves_in_mapchunk"))
-if setting then
+-- Extra check to prevent mod griefing in singlenode, mcimported worlds.
+local mg_name = minetest.get_mapgen_setting("mg_name")
+if mg_name == "singlenode" then
+	probability_railcaves_in_mapchunk = P(0)
+elseif setting then
 	probability_railcaves_in_mapchunk = P(setting)
 end
 
diff --git a/settingtypes.txt b/settingtypes.txt
index 49274244a..b7a75e526 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -126,3 +126,7 @@ mcl_superflat_classic (Classic superflat map generation) bool false
 # WARNING: This setting has quite poor performance and can slow down your
 # game by a lot.
 mcl_node_particles (Block particles detail level) enum none high,medium,low,none
+
+
+# If enabled, will run an LBM to fix the top 1/2 of double plants in mcimported worlds; defaults to true.
+fix_doubleplants (Mcimport double plant fixes) bool true