Do you create a canvas app based on your SP List data source?
I have made a test on my side, and don't have the issue that you mentioned. Based on the error message that you mentioned, it seems to tell that there is something wrong with the SP List connection in your app.
Please check if you have assigned proper permission of your SP List to your end users. Also please consider remove the SP List connection from your app, then re-add a new connection to your SP List from your app, then re-publish your app, check if the issue is solved.
In addition, please consider turn off the "Improved app rendering (final validation)" option and "Explicit column selection" column within Advanced settings of App settings of your app, then re-publish your app, check if the issue is solved.
Community Support Team _ Kris Dai If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.