Rasters not exporting correctly from mosaic dataset

[MiniR]

I have 12 images in a mosaic dataset. After setting the sort and resolve overlap options, I'm attempting to export the final mosaic raster but only one of the 12 .tifs is exporting.

I am exporting the raster using this method (which has usually worked fine):

The exporting process completes but, like I said only for one of the rasters. None of the other rasters appear. I exported with a data value of 0 and all the space behind the raster is black, when i export no data as 255, the background is white.

I have made sure that none of the images are selected in the footprint attribute table thinking that maybe that's what's causing only one image to export, but still doesn't solve the issue.

Anyone know what's going here?

[DanPatterson]

Why not use 

Copy Raster (Data Management)—ArcGIS Pro | Documentation

make sure you set any environments you want preserved/used in the Environments tab for the tool.