X-4 has no transparency reduction. Transparency is alive. Flattened PDFs, like X-1a or X-3 have often stitching lines which are sometimes visible in the final product That must be avoided. Avoid EPS too.
I know that the TE gets the PDFs srom outside. Depending on his answer I would give an advice how to solve the problem properly. Another solution could be to ask the deliverer for a different made PDF.
I have reasons for the questions I am asking as a qualified answer requires specific information.
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