I'm running into a strange behavior: For the first time opening my dashboard, the dashboard always shows no visualization for the data, as if the query for the dashboard has not been executed or the query produces no data. Simply reloading the page still does not show the visualization for the queried data. However, if I edit the input field from which the query uses the token value for the query, as long as the value entered is different from the existing value, the dashboard will show the expected visual. But if I just reload the page again, then the visual would disappear!
I further confirmed that the problem can be reproduced reliably by reloading the web page of the dashboard. When there is already working visualization, once I reload, then the visualization will be gone.