Reproduction steps:
1. Open the attached to project "1383825-sample"
2. Open the "PrecissionScene" Scene
3. Observe the Main Camera's Frame Settings Overrides properties in the Inspector; note that Post-Processing is enabled, while all effects are disabled
4. Hit Play and observe the Console; note that the correct values are displayed (0.5 4096 16384 1)
5. In the Camera's Frame Settings Overrides properties toggle the Post-Processing property off, keeping all the individual effects disabled
6. In the Hierarchy window select the "Main Camera" object
7. Hit Play and observe the Console

Expected result: the correct value is displayed (0.5 4096 16384 1)
Actual result: a wrong value is logged (0.5 58.5 58 1)

Reproducible with: 7.7.1 (2019.4.34f1), 10.8.1 (2020.3.24f1), 11.0.0 (2021.1.28f1), 12.1.2 (2021.2.7f1), 13.1.3 (2022.1.0b2)

Note: results in 2021.2.7f1 and 2022.1.0b2 are completely different

Results in 2021.2.7f1:
Post-Processing on: (0.5058594 58.84375 58.84375 1)
Post-Processing off: (0.5058594 58.84375 58.84375 1)

Results in 2022.1.0b2:
Post-Processing on: (0 66.4375 60.25 1)
Post-Processing off: (0.5048828 58.8125 58.8125 1)