Issue:
You have styles set up with Wipeout objects that have plotted correctly until Civil 3D 2021. Those objects now plot black (and the wipeout is not honored), when using the built-in AutoCAD PDF drivers (DWG to PDF.pc3 and AutoCAD to PDF (various flavors here).pc3 files)
Causes:
This is a currently known defect in the Civil 3D 2021 software. Autodesk Software Engineering is aware of this behavior and is investigating for a code fix in a future update. The reference ID is ACD-11504. There currently is no date as to when this defect may be corrected.
Currently the Civil 3D 2021.1 update has not corrected this issue.
Solution:
There are a few possible work-arounds:
1. Either use previous versions like 2020 to plot PDF’s, or to use a 3rd party PDF driver (like BlueBeam, Adobe, novaPDF, etc.), this works until you need to Publish a set, then look at option 2 below.
2. Change the Masking object to a hatch, set to plot in the CTB file as a blank hatch (usually color 255 at 0% screening)​.
a. Be aware that if you bring across blocks from a reference template that Draw Order is not honored, as the block definition in your drawing is overridden by the reference template block.
b. To correct that, edit the block, copy the linework (not the hatch), erase the original linework, then move the copied linework back to where it belongs. This is the old-school draw order, so it will set the order as hatch at the farthest back, then the linework on top of that)
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