I have the same Wappler version and for me it is working without issues, check your DB settings I think sometimes Wappler (update) can rewrite the db conn. If you haven't checked your database connection, try this
Development environment
Go to your App Connect definitions
Then select the db conn from the database
Check your db settings, and also double check your db service.
This is sadly not the issue. I already checked this now three times. Everything is perfect. My connection is also perfect, as the DBManager is able to fetch the data.