Custom Metrics in azure Monitor Plugin not working

We configured a datasource for the appInsight service in the azure Monitor Plugin. The standard appInsight metrics work fine. We also see the list of customMetrics in the select-field “Metrics”, but no data is found and therefor no diagram presented.
We use grafana 8.3.3 and plugin version 0.3.1.
Is there any solution for this or do we have to wait for the next version (we saw in the documentation that there are changes regarding this configuration in the upcoming version).
Thanks!