Hopefully, it’s one off issue.
It is not a new app and is deployed.
The table has only one column and one row (used it to summarize other table values using virtual columns) It would not load any data initially.
So I had to relink the table to the correct source, but the data was not loading. Only after I add a new column and regenerate, the data was loaded correctly.
If I find similar issues in other apps, I will update this. If you have similar issues, please post here.