Using Helmod and YARM with GUI Unifier is fine, but when I uninstall GUI Unifier, its frame remains even in new games in addition to existing saves.

https://imgur.com/a/fUjDIn4

+1

I can't get the mechanism how an uninstall mod can affect newly started game:)

I uninstalled the base game and removed all locally generated files under AppData\Roaming\Factorio then reinstalled it from Steam.
I started a new freeplay and the frame did not appear.
I then installed helmod and unchecked its own button then the empty frame appeared again without installing GUI Unifyer.

Now the culprit is not GUI Unifyer but helmod.

I think this is maybe a vanilla bug. this also happens with Factory Planer as well. this bug occurred when I didn't even know GUI Unifyer existed

.

There is some wierd interactions happening during this "left over" time. I accidently removed the mod and saved the game, realizing afterwards upon reenabling, it does not work as intended, border does not change etc, having mod still on in this broken state gives me lags spikes when placing concrete tiles.
Uninstalling it obviously leaves leftovers, buttons look like double border:
https://i.imgur.com/WnYmg3I.png