Ray-Tracing renderer not working, everything is black

Affects beta 1.16.220.52

Same...

What I did

1. Go into world

2. Enable raytracing

3. Minimize Minecraft

4. Open windows settings

5. Enable game bar

6. Re-open Minecraft

After doing this, the lighting was gone. Everything was black except the luminescent text on signs. Disabling raytracing had everything back to normal.

I am using the Kelly's RTX resource pack for raytracing. It is not on the world resource packs, it is on my resource packs.

Upscaling is disabled, but now even with RTX on I can't turn upscaling on.

After leaving with RTX off, disabling Xbox game bar and Kelly’s RTX and going back in, I left, and when I went back in I re enabled Kelly’s RTX and then everything was normal again and I could turn on RTX and upscaling

In my case minimizing program causes this in 100% chance. 

Exact same problem as the footage shown. Only happens when alt tabbing the game AND only if game loses focus and get minimized, maximizing the game will crash ray tracing and black all around as shown. (using ";" to turn ray tracing off of course fixed the problem but not really a solution)

Needs to restart game to get it working again!

Also need to fix another issue when game minimized on multiplayer lobby everyone will get kicked out except the host due to the game not being focused. extremely annoying as every time I need to alt tab I need to make the game window mode and be careful not to minimize or everyone get kicked.
*Quick note*: even though minimizing the game would kick people out, a while back ray tracing would of not crashed. Not sure if a new update caused it or something else like new GPU driver.

I confirm this issue.

This issue has been fixed in beta 1.16.230.50.

In my case of everything going black, when I turned rtx on and off too many times at once, it broke.

⚠️ Please do not mark Unreleased Versions as affected. You don't have access to them yet.

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I was able to find a temporary fix for this (although it would likely have some side effects with applications requiring dx11). For me this issue only started to occur after I installed MSI afterburner which also installed Riva Turner for displaying FPS, temps, etc. The Riva Turner installation also installed dx11 as a pre-req. I went into my system32 and SysWOW64 folders and moved the d3dx11_42.dll and d3dx11_43.dll files to a temporary folder. After removing those files I've had no issues with running RTX texture packs and alt+tabing. I'm running version 1.16.221.

Can confirm Kane's temporary fix. Moving the DX11 DLL files he mentioned into a temporary file allowed the game to render RTX properly and not be a blackscreen.

This issue occurred for me after I updated my GPU drivers to 466.27

System specs:
RTX 2070 Super
Ryzen 5 3600
16 GB 3200MHz CL16 

Issue seems to be persisting in the v1.17.0 update.

This issue occurs for me almost instantly when I enter a world.
Edit: setting "gfx_vsync" from 1 to 0 causes this issue to appear less frequently

I've had the exact same problem, it seems like my computer is a lot different from others so I wonder about how to fix it. 
Here's what I did:
1. Un-Overclock and reduce GPU voltage 
2. Restart computer (first time)
3. Try turning on and off random settings in NVIDIA Control Panel.
4. Turn on Free-Sync and turned it off after realizing it doesn't help.
5. Restart computer
6. Redone step 1 but this time closed Minecraft and reboot it for multiple times.
7. Installed patch for NVIDIA settings.
8. Restart computer and open up Minecraft.

After doing all that, it never worked. I'm concerned if my PC, Display Card and Monitor is compatible as I am not using an RTX graphic card.

Here is my PC Specs (that I know)

Intel Core i5-10400 Processor (6 Cores/12 Threads)
NVIDIA GTX 1660 Super 6GB VRAM (I think..)
Double 8GB RAM DDR4
Samsung LC24RG50 Odyssey Gaming Monitor (144Hz)

I tried my best to get this work but all solutions seems like it doesn't work or even exist in my PC.

I followed @kane's steps but simplified:

1. Navigate to C:\Windows\SysWOW64

2. Right click on d3dx11_42.dll and d3dx11_43.dll

3. Send to zip folder

4. once they are backed up delete them in the SysWOW64 folder.

5. RTX works again.

Tried to follow the steps outlined by @kane and @Eric. Still did not work for me. Interestingly enough, after the bug happened I tried to download a new rtx world from the marketplace (as I had tried that before and it mysteriously temporarily fixed the issue). I got the message that my computer does not meet the system requirements and that I'd need a GeForce RTX 2060 (Or better) and Intel Core i5 or equivalent CPU. (Guess this is being tracked in MCPE-140674) The actual cards I have are the following:

AMD Ryzen 7 3700x CPU
Radeon RX6600 XT GPU

My graphics drivers are up to date. Minecraft version is 1.18.2

Edit: I've found "Updating" the resource packs folder by moving in/out files seems to temporarily fix the issue. The bug still occurs but much less frequently for me.

if your in dx12 rendering, doesn't matter if your using ray tracing or not, but if your in windowed mode (idk about full screen i don't play in it) if you switch screens, i.e to discord e.c.t.. or minimize the game, there is a slight chance your screen will black out and switch you to dx11 it happens randomly

here is error report from windows 10.

Description
A problem with your hardware caused Windows to stop working correctly.

Problem signature
Problem Event Name: LiveKernelEvent
Code: 117
Parameter 1: ffffa6885bd81460
Parameter 2: fffff8058bbdcd60
Parameter 3: 0
Parameter 4: 570
OS version: 10_0_19044
Service Pack: 0_0
Product: 768_1
OS Version: 10.0.19044.2.0.0.768.101
Locale ID: 2057

Extra information about the problem
Bucket ID: LKD_0x117_Tdr:3_TdrBug:575504_IMAGE_nvlddmkm.sys_Turing
Server information: 7e0bdb8d-599a-4479-9d12-127098ab25a5

I can confirm the LiveKernelEvent problem affects myself as well, and after a long discussion with Nvidia support I discovered that by turning Vsync off for Minecraft in the Nvidia control panel the crash would no longer occur. As weedelbhoy1 has stated, it is a random occurrence, usually happening after leaving a ray tracing world and waiting in the menu for a while.