Interface Custom Properties are not visible in creating Alerts

Please help!

I am trying to build an alert that uses custom properties on interface.

Upon checking, the custom property option does not reflect on the condition selections.

Any idea on what can we do to fix this?

Screenshot_2021-01-19 Manage Custom Properties.png

Screenshot_2021-01-19 Edit Alert - Network Monitoring - Backhaul Routers Link - Down .png