PlayerGui Ancestry changing

Why is the ancestry of PlayerGui changing at the start of the game !?

LocalScript in ReplicatedFirst :

thisPlayer.PlayerGui.AncestryChanged:Connect(function(c, p)
	warn(c, p)
end)

RobloxPlayerGui

This causes an error at the startup of my game. I have not made any changes to my code since the last time I tried running my game, yet now I get an error because my loading screen GUI no longer exists becaue PlayerGui is doing strange things entirely unbeknownst to me…

This seems to be a consistent Roblox studio issue as of yesterday. Every game in which I set a loading screen within ReplicatedFirst has now recently been experiencing this issue !