To Simplify Things Out
As you can see, i got some weird collision bug, but nothing there ?
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Try checking to see if there is an invisible, locked part. Save your game, then run this in the command line to unlock everything in Workspace:
local descendants = game.Workspace:GetDescendants()
for index, descendant in pairs(descendants) do
descendant.Locked = false
end
If you regularly use locked parts, you can remember the name of the locked part, close and discard your changes, and then rejoin and remove the locked part.
i dont see any locked parts, im selecting all the part on workspace but none of the part there
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The collision seems to be where the shadow of your neon light is… did you use a trail or any additional part to make your neon light, and maybe that connected part is transparent, but cancollide=true? You won’t see it in your workspace top-level hierarchy because it is inside of the neon light model?
On second glance, I see the small circular parts at the bottom of your neon light… you used unions and negate to achieve those… maybe when you union the parts and negate, you left an extra part laying around… when you go to negate and union, it will disappear but remain cancollide. I would check by removing any unions in the surrounding area, and see if it fixes, then you can narrow down which union is the one causing issue and fix that one.
I feel I have the best solution here, if you are ever confused on how a objects geometry will effect collisions you can use this plugin Mesh Optimization Tools - Roblox made by CloneTrooper. I personally use it all the time when optimizing my game by clearing unnecessary collisions.
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So, this bug is caused by union’ing part ?
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No, before that the bug still. But i feel annoyed when this bug happens everytime
Im using that plugin too. But i dunno if that caused by union’ing part
The same thing happens to me with unions, the collisions always gets messed up. If you have any unions at that area, you need to change its “CollisionFidelity” property to “PreciseConvexDeposition,” which is one of the options. That should make the collisions inside the union more accurate.
I Saw, when youre union’ing part, the part Will appear on that place before changing the position. This happen like half second
But changing to PreciseConvexDeposition, is a huge bump on performance even on “gaming laptop”.
What im saying is if in creating union you dont make the part that you negate noncollide first, then when you make union it will remain collide but transparent. Take away all objects in that immediate area to test, then add them back one by one to find out which is causing issue. It cant be that one little area is bugging out all by itself.
It seems to be a problem, Ima test that later
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When you use the plugin that @SillyMeTimbers recommended what does the shape of the Union look like?
Try moving your neon light 100 studs away and see if the issue still happens next to it, or at the same place on the baseplate.
To add to my previous suggestions… it can also be a part of the union you created in your doorway that you are moving, and this is colliding with the neon light… so once you test your neon light for invisible parts, then test your doorway that you’re moving to make sure there are no invisible collide parts unioned improperly to that one either.
bruh, i forgot to delete that plane lol, btw thank you for all the help. 
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