Power BI Dataflow with column type text having null value is rendered as blank in dataset

I have also found this to be the case. What's frustrating is that when a data flow entity shows null values for a text column and then you pull that entity (to create a linked entity ) in a separate data flow it comes up as blanks rather than null values.

In other cases, I've had dataflow change a text column into date type when pulling as a linked entity.

Microsoft please fix these issues, data types and values should not be changed when pulling entities from data flows.