Grouped objects on base showing as individual parts on layer

Speaks for itself really. I'm trying to change the state of a group of objects on the base when a layer opens and the timeline on that layer begins, but when I go to choose the grouped object in the trigger menu it's showing in its individual parts and not as a group. I know the work around but it's long and messy and I want to understand the reason why the group isn't showing on the layer.

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