Placed InDesign files not exporting to PDF

Ever since the update in November last year we have not been able to successfully export any files that contain placed InDesign files to PDF. I placed a post in the community forums last year where multiple other people experienced the same issue but now that post is gone without being addressed so I am posting it here again.

Last year the exported PDFs resulted in low resolution images regardless of what export settings were used. Now we aren’t even able to generate a PDF with constant errors.

The reason we used placed InDesign files is so that if any changes are made to the original we’ll know because the file will show as modified. I do not want to copy and paste the InDesign file or place a separate file like a PDF or JPG as that doubles our work and doesn’t guarantee us that we will make sure all files are up-to-date. 

We’re using InDesign 21.2 on a 24 inch M1 Mac - everything was working fine until the latest update and we can’t afford to revert back to the previous versions now.

I need a solution for this ASAP as it has been almost 4 months without a sloution and it is affecting our productivity.

Also why doesn’t InDesign show up in the Category dropdown on this form? How do I know this query will go to the right location? And now I have no choice but to select an option and hope it goes to the right people.