Plugin always returns previous value for a NULL value in query

Hello everyone, I was trying to execute a redshift query from Grafana using the redshift datasource plugin. The result set had some NULL values in them.

The fill mode is set to previous value in Grafana by default, we changed it to NULL and executed the query, but the result set had the NULL values replaced by the previous value of that field. Even if we choose custom value as the fill value, it still gets replaced by the previous value. Are we missing something?

Have raised a github issue for the same.

Grafana version - 8.3.0
Redshift datasource plugin version - 1.0.1