Random RESERVED_TOTAL grouping when using GA4 live connector

Hi,

this is the first time I'm asking a question in the new forum. I was totally frustrated with the old forum and had given up my hopes there, so I cross my fingers that the new forum is actually helpful.

I'm actually very surprised that this hasn't been asked before. It was a common topic in the old forum. 

There is a bug in Looker Studio that randomly occurs, which groups dimensions into a RESERVED_TOTAL value.

Ktrs_0-1729247874787.png

I know this is a bug and not the result of some incompatible dimension/metric combinations, because when I go to edit mode and duplicate the table, the new table loads the data properly.

So these two tables are exactly the same:

Ktrs_1-1729248023749.png

What might be the cause of that?

The data source is a blend of GA4 live connector and a BQ table, joined via campaign. 

 

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