Progress bars going to 100%. Many games are guilty of this, Baldur's Gate 3 most recently. If 100% are loaded, why am I seeing the loading screen still? The game should be starting. You're clearly not at 100% if I'm still watching the loading screen. It should be impossible to see a fully filled progress bar.
Artificially make progress bars stop at 99% if you must, it's still better than watching 100% being a clear lie.