WebGL Dev mode not giving human readable error

Hi, I'm using Unity 2020.2.1f1, and I've hitting problems with my current WebGL build. Basically, the preload just doesn't run as expected, so I checked the console, and all I can see as a possible problem is

WebGL: INVALID_ENUM: getInternalformatParameter: invalid internalformat

I've copied this directly from the console of the WebGL Dev build, so I have no idea even which script has the error

 

I also cannot run my game build with 2020.2.1f1

I have this warning:

1. WebGL.framework.js:2 WebGL: INVALID_ENUM: getInternalformatParameter: invalid internalformat
2. _glGetInternalformativ @ WebGL.framework.js:2

Followed by

1. Exception at:
2. Error
3. at jsStackTrace (http://localhost:52008/Build/WebGL.framework.js:2:16493)
4. at stackTrace (http://localhost:52008/Build/WebGL.framework.js:2:16664)
5. at http://localhost:52008/Build/WebGL.framework.js:2:3544
6. at http://localhost:52008/Build/WebGL.wasm:wasm-function[102515]:0x1f56d07
7. ... a tone of unreadable stacktrace

And two errors:

1. exception thrown: undefined - Exception catching is disabled, this exception cannot be caught. Compile with -s DISABLE_EXCEPTION_CATCHING=0 or DISABLE_EXCEPTION_CATCHING=2 to catch. WebGL.loader.js:1:4256
2. Uncaught undefined - Exception catching is disabled, this exception cannot be caught. Compile with -s DISABLE_EXCEPTION_CATCHING=0 or DISABLE_EXCEPTION_CATCHING=2 to catch. WebGL.framework.js.gz:2:563707

Only way I found after a day trying, was enabling all debug options, full stacktrace and everything. Ok it showed some warnings I've fixed, but still not playable in release, and unplayable in this debug condition...
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EDIT: checking "Data caching" & "Decompression Fallback", and unchecking "Prebake Collision Meshes" & "Optimize Mesh Data" made my build run !

 

If anyone is also passing by here, but this solution doesn't work for you, I had the same problem and I fixed it because has this post: I added universal RP to my game and now on only WebGL everything is invisible : Unity2D (reddit.com)

All you had to do was enable "Post processing" on the main camera.

 

for me in unity 2020.3.1f1 , it solved by making "WebGL 1.0" the default instead of "WebGL 2.0"
Project Settings->Player->Other Settings->Rendering->Auto Graphics Api=unchecked , and drag WebGL 1.0 to be upper than WebGL 2.0
and its done, then use compression type gzip or brotli