Define/Build Overviews with ArcPy

[IceCreamBean]

Using ArcPro 2.9 I can Define and Build Overviews using all the default settings successfully (output is TIF overviews), but trying the same in a script using Arcpy with the default ArcPro environment the TIF overviews are consistently blank no matter what I try. That is, the actual TIF files themselves are mostly empty (only a few kilobytes each) and although they are in the mosaic dataset table, they do not draw at all. 

Is this a known bug? Even when copying the python output from ArcPro it will not work in a standalone script. 

[DanPatterson]

Build Overviews (Data Management)—ArcGIS Pro | Documentation

You are using that?  T

Definition Query perhaps?

BUG-000103572: Overviews are not generated for a mosaic dataset whe.. (esri.com)

Bug BUG-000103572
Synopsis
Overviews are not generated for a mosaic dataset when running the Build Overviews tool with a definition query in ArcGIS Pro.

[IceCreamBean]

Hi Dan, thanks for the reply. There is no definition query. 

The command is as follows:

arcpy.DefineOverviews_management(mosaic_dataset, overview_dir)
arcpy.BuildOverviews_management(mosaic_dataset)

[DanPatterson]

Don't know, but this appears in the help topic

• You cannot build overviews for a referenced mosaic dataset.

If you think it is a bug, then I would flag it to tech support.  At least they can track down why your process is failing.

[IceCreamBean]

Hi Dan, thanks for the reply. Not using a reference. I'll look into tech support.