Hi,
Could you test it after initiating a ping between the switches. There should have been a ARP entry on the uplink for the IP to get populated in "show edp ports detail" output. Below is the sample output from my lab switch:
Below is the link to the KCS article explaining this feature:
https://gtacknowledge.extremenetworks.com/articles/Q_A/What-is-the-command-to-restrict-unknown-unicast-flooding-during-EAPS-or-STP-failover