I have FL and Alabama charts loaded to include everything except IFR Hi charts.  You can see from the linked picture that when I zoom in (zoom 21), the chart disappears North of certain point.  When I zoom out, past back past zoom 21, it all comes back.  This is consistent behavior on my Google Pixel 3A and my Samsung Tab S 8.4" and I did not notice this every happening until I updated my charts yesterday.
Scrolling the map around a bit I can see that there appears to be a missing chart section at the higher zoom levels as the blank spot is clearly rectangular.
See the link for a screen capture.    https://photos.app.goo.gl/UsmPLb4UgrqDorMm7
Chad