The workaround I found (prepare for a ridiculous one, but what you gonna do):
- select the group you want to change color of,
-Cut,
(- get outside any group it may reside in if the case)
-Paste in Place,
-Ungroup,
- change color, with Picker on otherwise,
- Group back,
- Cut,
(- get inside the larger group it was in)
- Paste in Place.
The workaround I found (prepare for a ridiculous one, but what you gonna do):
- select the group you want to change color of,
-Cut,
(- get outside any group it may reside in if the case)
-Paste in Place,
-Ungroup,
- change color, with Picker on otherwise,
- Group back,
- Cut,
(- get inside the larger group it was in)
- Paste in Place.