Hi . Here is the project.
https://www.dropbox.com/s/f5b0xfzi5yi65d9/MSAADepth.zip?dl=0
Just toggle between MSAA and FXAA/TAA, and the issue should appear.
The posts from the material’s page are mine, as is the workaround which I found after I made this post. However the workaround is noticeably less accurate and doesn’t fully solve the issue.
Basically the issue seems to stem from this:
This is a screenshot taken from another project. One under MSAA, the other under FXAA, while using the post process material below. The depth comparison produces entirely different (incorrect) results under MSAA.