Activity diagram Item flow between Actor and Block

Hi everyone,

I’m working on a model for my system’s behavior using a SysML activity diagram. I’m trying to add item flows to sync it with the system context, but I’ve run into an issue: the Item Flow Manager is not accessible for object flows when the Call Behavior Action is in a swimlane for an actor part. If I try to open the Item Flow Manager on an object flow between swimlanes for block parts, it works as expected—only the actors don’t.

I’ve modeled the human actor as an "Actor". What’s going wrong?