when launching any world with an approved RTX texture pack and approriate hardware, everythings runs fines up until the point you switch from fullscreen to windowed or vice versa while in-game by pressing F11. Switching it back don't resolve the problem, the only way to go back to normal is to quit to the main menu and enter the world again.

when you do that, everythings seems to only rely on reflecting colors (clouds now looks like mirrors, trees as well, water is just way off)

setup used:

version already mentionned.

RTX texture pack: happens with the NVIDIA PBR pixel art with blockworks and also the Vanilla RTX by Nicinator (I haven't tried with others)

GPU: RTX2080

CPU: i5 8600k

RAM: 16GB

reproduction rate with my setup: 100%
1. open up a Minecraft world with and RTX texture pack enabled

2. press F11, realise that the bug is now occuring