ARP on the ZTNA TAP adapter

Hi

While researching some RDP connection drops over ZTNA, I discovered some unusual ARP behavior on ZTNA TAP adapter: unicast ARP (for ARP table renewal) is never answered. The host (or ztna-gateway, i'm not sure) waits for the broadcast. So there is a lot of unicast ARP traffic going on, but none is answered. Is that expected behavior or something to look into? 

Best regards, Janez