Two bugs, both related to the Environment Lighting setup.
When a new file is created with EEVEE/Cycles as the default engine and an Environment Texture with a HDRi image is setup.
Or an older Blender 2.8 file setup with a previous RPR for 2.80 is opened.
Nether scenario preserves the Environment settings (they should be setup in the IBL section).
This also includes the intensity setting which is not preserved from either of the above beginnings.