How to solve the problem with the camera (Perspective) in a 2D project on Unity?

Question

Unity

For a 2D game on Unity, greyboxing has already been done, for tests, but here's the problem. Since this is a metroidvania with the Parallax effect, it was decided to use perspective. I'm using standard Cinemashine. While running, such artifacts appear as on the screen. Roughly speaking, parts of the floor simply disappear from view. The character is on Z0 as is the surface he is running on.

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Also sometimes appears on the ceiling

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I can't figure out what the problem is. The project uses the Universal Render Pipeline.