Hi,
Seems that one of the reasons is that SharePoint list items access rights are not fully sent to and managed by PowerApps.
On my side, changing many times list item permissions in SharePoint worked well with PowerApps during a long time, until yesterday when the message first displayed. But I had no malfunctions, only the message display.
The app is entering into production within a few weeks, thousands of users won't be reassured by this kind of message, and we do not have time to wait Microsoft's action, so I decided to manage all list items permissions entirely into PowerApps and now there are no more messages of this kind.
I replicated the incident:
- Go to the SharePoint List Settings > Advanced Settings > Item-level Permissions > Read access
- Change from "Read all items" to "Read items that were created by the user"
- Update PowerApps => the message is displayed
- Change back from "Read all items that were created by the user" to "Read items"
- Update PowerApps => the message is no more displayed
Hope this helps