What are all this Shader errors from Post-Processing that appear everytime I update Unity and why?

Like the title says, everytime I update Unity this kind of errors appear all over the place, blocking me from building and, sometimes, even from seeing what the camera is showing. I always solve them by my own by subtituting the original #include code line for the full real path, and that seems to work (most of the times). But I don't understand what's happening, why are these errors appearing again in every Unity update? am I the only one getting this?



You need to be using the Post-Processing package.

 

I reported the bug and they solved it for me: my Library folder was corrupted, all I had to do was erase the Library folder and reopen the project. Solved!