Impossible to set custom resolution in 5.5. Do you can?

I have a game where I set the resolution without problems in 5.3, but in 5.5 it seems totally broken. In fact. I think it’s related to a broken thing regarding the access to Viewport data, as something as basic as getting the viewport size is getting some weird data, sometimes.

Well, in 5.3 I could set my resolution with Game User Settings + Set resolution nodes, but also with r.setres cvar. The issue is when doing it in 5.5, and specially noticeable when the desired resolution is higher than the native one, and trying to force it fullscreen. In 5.3 it was working fine, rendering a 4k image in a QHD monitor, for example, but in 5.5 the 4k image will go outside the borders of the smaller screen.

Have you tred it? How can be this thing so broken? Do you have any workaround, please? This is so elemental!!

PS: always talking about a packaged game.

@Amanda.Schade