I just solved it by uninstall all mods, ESPECIALLY the ue4ss mods. I cannot enter the vent, even with all vortex automatic mod disabled. But after I moved dwmapi.dll and ue4ss folder somewhere else (it is manual mods), and I can enter there. IDK what caused that though, seems something with ue4ss script confilct with some game script name to actually open that vent. Then pass the tunnel, save again, enable all mods and move dwmapi.dll and ue4ss folder back, currently everything works well.