Schema missing in Purview for some datasets

Hi All,

I'm very new to Purview, only just got access to it today but been playing with it and managed to ingest our Power BI Service metadata into it. The problem is that for some datasets the schema information seems to be missing, for others it's there in full detail and I don't know the specific reasons why. For one of the datasets where the information is missing, I can only see an Additional columns truncated entry, but nothing else... The scan completes with no errors as well, so seemingly everything is fine. I know lineage can be missing if the Enable load is unticked for some of the tables, but all tables in this dataset are included in the load, and the dataset has refreshed many times in the Service before.

Has anyone had this issue before and knows how to resolve it?