How to reproduce:
1. Open the attached project ("case_1205635-RecoderPhysicalCamera.zip")
2. Open the repro scene ("SampleScene")
3. Select "Main Camera" and make sure that "Physical Camera" checkbox is
4. Open the Recorder tab and start the recording
5. Stop the recording and check the newly created video

Expected results: Output is equirectangular
Actual results: Output is not equirectangular and cannot be played as 360° video

Reproducible with: 2018.4.16f1, 2019.2.20f1, 2019.3.0f6, 2020.1.0a21
Couldn't test with 2017.4 (package is not supported)
Reproducible with package versions: 2.0.3-preview.1, 2.1.0-preview.1

Fogbugz [https://fogbugz.unity3d.com/f/cases/edit/1205635/]

All details and sample project is there: [https://stackoverflow.com/questions/59239336/record-360-video-in-unity-is-not-equirectangular/59283732#59283732]

This issue happens on all Render Pipelines, see screenshots below for current behavior. Every face of the 360 cubemap appears too "zoomed in" as if the Physical Camera attribute was not taken into account:
!360_physicalCam_LEGACY.png|thumbnail!
!360_physicalCam_URP.png|thumbnail!
!360_physicalCam_HDRP.png|thumbnail!