Embedded Google charts stop displaying

My app’s URL: https://vlp-demo.glideapp.io

My app has several Google charts embedded as images. I can get them to work initially, but frequently, when I come back to the app after a few hours or the next day, some of them will no longer display. The Glide Image component is still there, bu it just displays a the image placeholder.

I can “fix” the problem by copy-and-pasting the chart in the Google Sheet and creating a new publishing link (just creating a new link does not fix the problem), but this seems to be temporary, and the chart may disappear again.

Has any body encountered this? Any solutions?