Prevent knockout by using the Overprint options in the Attributes panel in InDesign.
How do I check for overprint and how to switch it off?
The dreaded white box: How to identify overprint issues. - Eagle Web Press
Where is the overlay option in InDesign? - Quora
Overprinting in InDesign
adobe indesign - overprint showing wrong in output preview on different profiles - Graphic Design Stack Exchange
Turn on Overprint Preview Before Printing
print design - How to turn off overprint in Indesign? - Graphic Design Stack Exchange
The dreaded white box: How to identify overprint issues. - Eagle Web Press
The dreaded white box: How to identify overprint issues. - Eagle Web Press
Beware Overprinting White
What is Overprinting and How it Can Ruin Your Print Marketing