Cannot drag and drop to add an element into array

[thestonefox]

Unity 2022.3 (also 2021.3 i think)

• Create several BooleanActions.
• Inspect one of the BooleanAction.
• Drag another BooleanAction into the current one's Sources array header
• expected behaviour: that other BooleanAction is added into the Sources array
• current behaviour: it is not added
• guessed reason: Sources array is List

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• Create TrackedAlias and inspect it
• Create a camera rig (e.g. oculus intergration camera rig)
• Drag the camera rig into TrackedAlias Camera Rigs array header
• observed the rig is added into the array
• guessed reason: CameraRigs is derived from ObservableList