Since the August 2025 update it appears Direct Query connections cannot be selected when connecting to Dataflow Gen 1 sources. Any reports that were previously setup using Direct Query return the ...
ChristopherKing
Advocate I
Advocate ISame issue, we rolled back to the July 2025 update. This issue also causes models with complex transformations to perform much worse or not at all even when in import mode while using PBI Desktop. The reports continue to work fine if they are published.