Expand Values - Records and Lists

You have to transform the record and lists into a common format (or if you're really sure that records can be ignored, turn them into lists).

This blogpost describes the general technique: https://www.thebiccountant.com/2017/07/25/how-to-expand-a-column-that-cannot-be-expanded-in-power-bi-and-power-query-in-excel/

But in general I'm a bit suspicious when I see such a scenario. Often it means that these are very different data that should be channeld into 2 different tables. So again, if the records are all null and should be ignored, you can just add a condition that returns an empty list instead.