Doors can't push nodes into players directly.

docs/issues.txt

@@ -19,8 +19,6 @@ ISSUES: Bugs, Cleanup and Refinements
 	- Dirt->sand leeching
 	- Time for an audit again...
 
-- Glass not cooling when water flows above (should).
-
 - Totes should not deploy if ents or interact-players are in the way.
 
 - Retest conservation of fuel at full strength, consider reinstating?
@@ -29,9 +27,6 @@ ISSUES: Bugs, Cleanup and Refinements
 - Flammables should respond via AISM when bathed in fire or igniting
   liquids like molten glass or rock.
 
-- Nodes pushed by doors shouldn't move to collide with players/ents
-  either, just like doors themselves.
-
 - API for allowing mods to customize player texture.
 	- Maybe nodecore.register_on_player_textures(layers) where
 	  layers is an array of entries, each having {name = "",

mods/nc_api/util_misc.lua

@@ -349,3 +349,26 @@ function nodecore.rate_adjustment(...)
 	end
 	return rate
 end
+
+function nodecore.obstructed(minpos, maxpos)
+	if not maxpos then
+		maxpos = {x = minpos.x + 0.5, y = minpos.y + 0.5, z = minpos.z + 0.5}
+		minpos = {x = minpos.x - 0.5, y = minpos.y - 0.5, z = minpos.z - 0.5}
+	end
+	local avgpos = vector.multiply(vector.add(minpos, maxpos), 0.5)
+	local radius = 4 + vector.distance(minpos, maxpos) / 2
+	for _, obj in pairs(minetest.get_objects_inside_radius(avgpos, radius)) do
+		local op = obj:get_pos()
+		local cb = obj:get_properties().collisionbox
+		if maxpos.x > op.x + cb[1] and minpos.x < op.x + cb[4]
+		and maxpos.y > op.y + cb[2] and minpos.y < op.y + cb[5]
+		and maxpos.z > op.z + cb[3] and minpos.z < op.z + cb[6]
+		then
+			local lua = obj.get_luaentity and obj:get_luaentity()
+			if not ((lua and lua.is_stack) or (not nodecore.interact(obj))
+				or (not nodecore.player_visible(obj))) then
+				return obj
+			end
+		end
+	end
+end

mods/nc_doors/operate.lua

@@ -23,8 +23,9 @@ local function conveytrace(okay, seg, u)
 		local w = convey[u.tkey2]
 		if w then return w end
 		if nodecore.buildable_to(u.to2) then
+			local ok = (not nodecore.obstructed(u.to2)) or nil
 			for x in pairs(seg) do
-				okay[x] = true
+				okay[x] = ok
 			end
 			u.to = u.to2
 			u.tkey = u.tkey2
@@ -34,8 +35,9 @@ local function conveytrace(okay, seg, u)
 	local w = convey[u.tkey]
 	if w then return w end
 	if nodecore.buildable_to(u.to) then
+		local ok = (not nodecore.obstructed(u.to)) or nil
 		for x in pairs(seg) do
-			okay[x] = true
+			okay[x] = ok
 		end
 	end
 end
@@ -181,19 +183,7 @@ function nodecore.operate_door(pos, node, dir)
 			}
 		end
 
-		for _, obj in pairs(minetest.get_objects_inside_radius(to, 2.5)) do
-			local op = obj:get_pos()
-			local cb = obj:get_properties().collisionbox
-			if to.x + 0.5 > op.x + cb[1] and to.x - 0.5 < op.x + cb[4]
-			and to.y + 0.5 > op.y + cb[2] and to.y - 0.5 < op.y + cb[5]
-			and to.z + 0.5 > op.z + cb[3] and to.z - 0.5 < op.z + cb[6]
-			then
-				local lua = obj.get_luaentity and obj:get_luaentity()
-				if not ((lua and lua.is_stack) or (not nodecore.interact(obj))) then
-					return
-				end
-			end
-		end
+		if nodecore.obstructed(to) then return end
 
 		local str = minetest.pos_to_string(to)
 		if squelch[str] then return end