RTXmode has some problem(screen become black)

When I open the game and open the map(official RTX resource pack and also, map is official), its normal and I can play as usual [Image:①], but when I change the screen for seconds,(Example: Win+D, choosing google chrome from taskbar) I saw lording screen for about 10~20 seconds [Image:②] (screen is normal but lording time is longer than before) and then reaching pause menu, then I click the resume button and everything of the game screen become black excluding particle(ex: torch particle) and signboard letters [Image:③](while on this problem, I can use pause menu, main menu, in-game object(ex:door)(also in-game object is invisible because of black screen)). When I reboot the game, its problem heals temporarily till I change the screen. While getting this problem I changed RTX-off in the settings and I found RTX-off doesn't being affected by this problem and this problem happens again when I changed back settings to RTX-on. (④ happened just once) (It happens all map using RTX)(This problem doesn't happened before today(before updating to recent version)) (I'm using RTX-2060)