Grafana dashboard not showing data after import

[d-Rickyy-b]

A user reported that the grafana dashboard doesn't show data right after importing it. Currently I don't know why exactly it happened.

Setting/Updating the data source for each panel fixes the issue. So I believe this has to do with some wrong data source id being stored in the dashboard's panels.

Maybe this can be somehow stored in a variable, so at least users wouldn't need to change every panel but to edit it in one single place.