Bug report #3811
Background color is not set in a composer even if set in project properties
|Affected QGIS version:||master||Regression?:||No|
|Operating System:||Windows||Easy fix?:||No|
|Pull Request or Patch supplied:||Resolution:|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||13869|
I think it should.
You can set it manually in properties of map object in layout, but it is not clear why it is not inherited from canvas.