core: improved building system

src/ReplicatedStorage/Shared/ChunkManager/ChunkBuilder.lua

@@ -9,6 +9,7 @@ local objects = script.Parent.Parent.Parent.Objects
 local RunService = game:GetService("RunService")
 
 local ChunkBorderFolder = game:GetService("Workspace"):FindFirstChildOfClass("Terrain")
+local DEBUG_GHOST = true
 
 local NEIGHBOR_OFFSETS = {
 	{-1, 0, 0}, {1, 0, 0},
@@ -108,10 +109,28 @@ function ChunkBuilder:BuildChunk(c: typeof(Chunk.new(0,0,0)),parent: Instance?)
 		local blockName = `{x},{y},{z}`
 		local existing = ch:FindFirstChild(blockName)
 		if d == 0 then
+			if c.delayedRemoval and c.delayedRemoval[blockName] then
+				c.delayedRemoval[blockName] = nil
+				if existing then
+					task.defer(function()
+						task.synchronize()
+						RunService.RenderStepped:Wait()
+						if existing.Parent then
+							existing:Destroy()
+						end
+						task.desynchronize()
+					end)
+				elseif DEBUG_GHOST then
+					print("[CHUNKBUILDER][GHOST] Delayed remove missing instance", c.pos, blockName)
+				end
+				return
+			end
 			if existing then
 				task.synchronize()
 				existing:Destroy()
 				task.desynchronize()
+			elseif DEBUG_GHOST then
+				print("[CHUNKBUILDER][GHOST] Remove missing instance", c.pos, blockName)
 			end
 			return
 		end