Describe the bug
In scenarios when we have a color applied to a Scheduler resource, the pre-defined color is not visualized as a background if we use the group prop. This happens when the resource is not available in the array passed to the group property. If the resource that holds a color is available in the group array, the colors are correctly displayed.

To Reproduce

1. Open this StackBlitz example
2. See the 4 events available in the view

Expected behavior
The events assigned to Room 1 should be with blue background and the events assigned to Room 2 should be with red/pink background. This should be valid for all scenarios in the Scheduler - with and without grouping.

Screenshots