Hi,
Apologies for the delay, thank you for the detailed repro project. It does sound like a bug as the tool tip says physic settings like collision profile and body settings are determined by the root.
I went ahead and created a bug report for this issue that can be tracked here if/when it’s approved for public visibility: https://issues.unrealengine.com/issue/UE-290782.
There is no ETA as priorities for bugs and features can shift at any time.
Regards