Plotting an AutoCAD drawing with hatch transparency to PDF causes a boundary to appear around the hatch. When this is printed, this boundary results to a black solid box/boundary. This behavior has been reported when printing PDFs to physical (paper) printers using: the Apple Preview app Microsoft
Solid hatches wont print all of a sudden - Autodesk Community - AutoCAD
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Topic: Why are There Lines Showing in My Solid Fills?
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Poor Quality Solid Hatch with transparency - Autodesk Community - AutoCAD Map 3D
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Solid hatches with transparency print as all black when sending AutoCAD-generated PDFs to physical (paper) printer
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Printer doesn't print hatch in transparency - Autodesk Community - AutoCAD