DT 3.9.5 & 3.9.6, dragging and dropping email fails

I’m on DT 3.9.5, Sonoma 14.3.1

• dragging an e-mail from Apple Mail
• dropping it on the “Global Inbox” in DT (the symbol in the sidebar or the list view, no difference)
• Error message “Apple Mail | Import of 1 message failed”
• dragging the same e-mail first to the Desktop and then from there to DT works ok
• tested with the “Sent” and the “Inbox” boxes in Mail, same behavior.
• terminated and restarted DT, no change
• restarted the mac, no change