When you change fields on your grid (ie. by the menu item field positioning) then after change the details are empty:
I added an extra field to the query: MONTHS_BETWEEN (SYSDATE, birthdate) / 12 AS age,
If I put this field on the grid, the details will be empty, if you remove it from the grid, the details are shown.
By the way, I have some samples where it’s completely unclear why the details are empty.