I'm at ZCM 11.3.2 ( I created an imaging bundle with some
actions in it and assigned that bundle to a group of devices. If I go in a
device relationships tab, I see the imaging bundle under Inherited tab.

If I try to "Apply Assigned Imaging Bundle" to that device, I receive that

No imaging bundle has been assigned to the selected device.
Ensure that the imaging bundle is assigned before attempting the Apply
Assigned Imaging Bundle action.

Can someone tell me what's wrong ? I do the same thing in ZCM 11.2.4 and
everything is working.

If I assign the imaging bundle directly to the device instead of the group,
it works fine.