Hello,
Recently while testing things for a game, I have found out a very critical bug happening; basically everything in a place is getting corrupted. (Textures are getting glitchy, some colors can change, size is glitching, position is glitching, shape is glitching)
In my example, the blue parts get invisible for 2 seconds once you touch them, then turn back visible, and after some tries (sometimes on first try), everything gets glitched.
This is how it should look:
This is the bug after it starts happening: (I have got a lot more where things are getting moved etc., let me know if you need it)
I have tried to identify why it happens and found the script causing it, it is basically a transparency property change clientsided, here is the example place, you can find the quick code I made to reproduce it under PlayerScripts, but it is very simple:
Roblox_Engine_Bug.rbxl (55.0 KB)
To make it simpler I have made it only happen when character touches the part, but pretty sure it happens no matter what when transparency happens. It could also be a mix of everything I use in the script.
local player = game.Players.LocalPlayer
repeat wait() until player.Character ~= nil
local character = player.Character
local CollectionService = game:GetService("CollectionService")
function TouchedHum(otherPart)
if otherPart.Name == "DisappearAppear" then
if CollectionService:HasTag(otherPart, "debounce") then
return
end
CollectionService:AddTag(otherPart, "debounce")
otherPart.Transparency = 1
task.wait(2)
otherPart.Transparency = 0
CollectionService:RemoveTag(otherPart, "debounce")
end
end
player.CharacterAdded:Connect(function(_char)
_char:WaitForChild("Humanoid").Touched:Connect(TouchedHum)
end)
character:WaitForChild("Humanoid").Touched:Connect(TouchedHum)
for _, part in pairs(workspace:GetDescendants()) do
if part.Name == "DisappearAppear" then
part.CanCollide = false -- I think it still happens without doing this
end
end
How to do it:
-
You need StreamingEnabled off for it to happen (I tried with StreamingEnabled and couldn’t reproduce the bug)(StreamingEnabled can be On, seems to happen less. But still happens with StreamingEnabled) - Client needs to transparency, untransparency a part, happens instantly most of the time. If it doesn’t happen rejoin
- It happens only in Graphic 7 and under apparently (never had it with Graphic 8 and upper, even if it could), if you were on Graphic 8 and upper, set your graphic to 7 and rejoin
- It doesn’t happen on studio, only on live game
- It didn’t happen on my phone, would need more testing though. (S21 Ultra)
I also thought it could be my drivers or graphic cards, but I don’t think so since some of my friends tried it and had that bug too.
Here is a test from one of them (@Lyzrinn) :
I have no idea what is happening, and if I should disable something in the game to prevent this! This shouldn’t happen and I’m not 100% sure what is causing this, changing properties clientside should be fine 
, my only thought is that client and server infos are not the same so the client is trying to fix it somehow.
Thanks for reading ! Let me know if you need more informations 
I didn’t see anyone posting something similar but I could be wrong. Please let me know so I can redirect to original bug report if there is one.