Transformation on Graph Panel Issue

I notice when using the “Add Field from Calculation” transformation on the graph panel that it does not connect between points even when you turn the setting on. I understand it is still in beta, but wanted to provide feedback. Does anyone know of a work around for this?

Hey, I have a similiar issue but worst. I have metrics with 1m interval. It shows normal without transform. But when I add a transform calculated field (whatever it is), the metrics disappear. I’m adding with and without transform rule screenshots by same date and data.

It works normal if I choose > 3 hours by the way.

Without Transform Rule,

With Transform rule added,

I need to know that do I miss something or is this a known issue?
Thanks all, regards.

edt: Grafana vers: 7.0.3