Thomas Zeman
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Same here. Torches and lanterns work as expected. But, light emitting blocks, such as glowstone, sea lanterns, redstone lamps, etc., do not emit light in RTX. Redstone lamps, for instance, do switch on and off, they are simply no longer emitting light. They do emit light in any other graphics mode.
This started for me with 1.21.90. I have reinstalled Minecraft, reinstalled video drivers, cleared the NVIDIA cache, cleared the DirectX shader cache. No change. This is true for every RTX enabled pack or map I have tried.
Something seems to have changed with the way light emitting blocks are coded, since Vibrant Visuals, that is breaking them in RTX.
I am successfully using a workaround, that is a combination of suggestions found in various forums. First, move your RTX texture pack to the global resources folder, instead of the resources folder in your world. Then, from the main Minecraft menu, go to settings, video, scroll down, and toggle “Allow in game graphics mode switching” to off. Don't worry if the graphics mode is set to Fancy. Go back to the main menu. Click setting again and toggle “Allow in game graphics settings” to on. Go back to the main menu again, click play, and open your world. Minecraft should detect the RTX pack, and set the graphics mode to RTX; glowing blocks should be working correctly. Unfortunately, you'll need to do this every time you open your world. If you're using an RTX pack from the Minecraft Store, you won't be able to move it, and the rest of the process may or may not work for you. I haven't tested it. I'm using a Patreon supported pack, and this works for me. Your mileage may vary, but it's worth a try.