Getting # icon while sharing the screen from Webex registered Video device

We have observed that in Zoom meeting, while joining meeting (in starting) and sharing the screen from Webex registered video device we are able to see "#" icon.

This # icon comes for 2-4 sec and they automatically disappears. We have not observed this behavior on standalone video device. 

we have checked with Cisco TAC as well but they informed that, this could be from application/host side.

anyone has faced similar issue?