showPopover ineffective?

Hi,

Calling the toolbarItem?.showPopover() method does nothing...

In my Info.plist, I set Action to Command (so the toolbarItemClicked event handler is called).

In toolbarItemClicked() I use:

                    window.getToolbarItem(completionHandler: { (toolbarItem:SFSafariToolbarItem?) in
                        toolbarItem?.showPopover()
                    })

But... the popover is not shown, and popoverViewController is not called.

What am I missing? I tried in Safari Tech Preview Release 85 (Safari 13.0, WebKit 14608.1.28.1)