Managed Property not showing correctly on Tenant?

Hi All,

We are using the highlighted Content webpart on a communication site to filter news when we setup the page we were able to  use the RefinableDateSingle00 managed property that was mapped to ows_FirstPublishedDate. In the last few days the RefinableDateSingle Managed property has disappeared. We are no longer able to select it in the webpart.

However we can still see the manager property under the search admin site?

What is going on?

This is a key business communication platform I hope someone can help?