Seems there is are timing problems with the refresh of SharePoint data sources:
I just added a new field to a SharePoint list and did the refresh of the data source as usual, but the new field is not showing up. Closed everything and tried again, still not loading. It worked for me with 3.20022.19 now with 3.20023.3 seems to be broken.
I tried the workaround deleting and reconnecting the data source, but did not work!
The changes in the SharePoint list are definitely there. I entered some test data into the new field. After renaming the new field again, and some new refreshes after probably 10 minutes the new field showed up in Powerapps but the initial name that has been changed in the meantime. Looks like I have to wait for another 10-15 minutes. Is this related to high loads on the platform? Can you please check?