VXLAN MAC issue

I am using VXLAN to bridge layer 2 between the switches on various different VLANs/bridge domains and I am seeing strange behaviour with the output from the following command

display mac-address bridge-domain <xxxx>

As an example I have set up a test between two of the switches using bridge domain / vlan 2039, switch 1 has a Vbdif interface with ip address 192.168.250.1 and switch 2 a Vbdif interface with 192.168.250.4.

I can ping between the two switches across VXLAN and for around 10 minutes the mac-address of the interface on the distant switch is visible as follows:

<ce1 >dis mac-address bridge-domain 2039

-------------------------------------------------------------------------------

MAC Address   VLAN/VSI/BD                      Learned-From        Type     

-------------------------------------------------------------------------------

d0ef-c19f-8c5f-/-/2039                         192.168.35.188      dynamic   

However after around 10 minutes this mac-address stops appearing in the output, despite still being visible in the switches arp table (and ping able).

If I shut down the Vbdif interface and then reenable it the mac address shows up in the output again, and I also observed that if I wait for the arp timer to expire (default 20 minutes) then the mac-address shows up once again, until a further 10minutes has past at which point it disappears.

Is this something you could advise on? Is it possibly a bug or a discrepancy between the timer values or similar?