Grafana does no longer show multiple queries in one Panel

I upgraded from Version 9.0.0 to 9.3.1 and all my Dashboards that used to work are not working correctly anymore.
For Example I have two separate queries, one to show measerument values in a time series and on to show the 6-sigma limits of the same data for the last 6 months (as two lines). Everything worked with 9.0.0 but after switching to 9.3.1 only on querie can be seen.

I think i somehow solved it for me. In the older Versions is was enough for getting horizontal lines to set overrides for Linestyle->solid; Style->lines and Transform->constant, after adding Connect null values->always it seems to work again