Appsheet Map Aerial Imagery Problem

I have an AppSheet app, in which I am using an aerial view as my map view, today somehow certain parts of the map, are showing ‘no imagery/image available here’. Is there anything I can do from my side to solve this or is this a Google Maps API problem?
I also have a KML layer too and parts of that layer are also showing ‘no aerial image available here’.
Thank you in advance