I am experiencing the same issue. When attempting to retrieve data from the past 2 to 3 days or the last 7 days, the numbers are displayed on the bars. However, when trying to retrieve data from the past year or month, the numbers are not displayed. It’s possible that the issue arises when there is a larger volume of data, preventing the numbers from being displayed.
It’s rather a workaround than a solution, but try to play around with the “Text size” parameter, it solved the issue for me. Size 12 is only an example, this size works fine for me, but you may want another one.