Pattern fill does not preview when placed in InDesign

[Scott Falkner]

I have an Illustrator CC 2018 file saved as .ai with PDF compatibility. It is just a rectangle with a pattern fill. The pattern uses simple shapes and a compound path filled with process black (which overprints) and a Pantone solid. When I place the file in InDesign CC 2018 the cursor previews the file, but only a blank image shows. InDesign will only preview the file when Separation Preview is on.

Odder still, whatever the image is behind does not show. So if I send the image to the back, everything is hidden. If I bring it to the front everything is visible, except the image. With Separation Preview on everything looks as it should.

I saved as IDML and deleted preferences. The problem is still occurring. This also happens when placing the Illustrator file in a new document. The file behaves normally when I expand the pattern.

Cross posting in InDesign.

[Monika Gause]

Can you upload a dummy version of that file to Dropbox or the like?

[Scott Falkner]

https://www.dropbox.com/s/gl0ol8nc19c16dq/Pattern.zip?dl=0

I am told in the reply to my InDesign post that this is a bug in InDesign when using overprinting objects. If I expand the pattern but leave the overprint the file works as expected. If I leave the pattern but edit the objects ion the pattern to remove the overprint the file works as expected.

Dropbox - Pattern_bug.zip