There might be a workaround to this issue that I am unaware of, but I have run into the instance where I have been sent a set of PDF's where there are solid hatches that are blocking information beneath it.
When I use Color Processing > Modify Colors it removes the hatches and I am able to see the information below, but I also lose the information that the hatch was conveying.
Recommending that an option be added to adjust the transparency of the color that does not make the color completely transparent.