So, I turned Composite Models preview feature on yesterday to review it. I got the top two errors on my imported tables. I turned it off and restarted PBID and refreshed all. Then, I got th...
Faster workaround:
Open Query Editor. Click Enter Data. Add a simple table with one column and one row. When you click OK, it will ask you if you want to switch all queries to Import mode.
That did it for me.
BUT, with Composite Models turned ON, it didn't help.