Post Processing Stack v3 has recurred a "viewport rectangle shift" bug

The following bug has recurred in Post Processing Stack v3.
https://issuetracker.unity3d.com/issues/post-process-layer-modifies-the-viewport-rect-of-the-camera

There was also a report on Twitter in the past.
https://twitter.com/Juicefoozle/status/1091805214443798528?s=20

My development environment is as follows.
Unity 2019.4.18f1(LTS)
Post Processing 3.0.1

Also, it has been confirmed that it works normally in Post Processing 2.2.2.

I want you to fix it if possible.
Also, can this be fixed on my own?

I'm waiting for an answer. thenk you.