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
Solved: Parts of Hatch Printing Black - Autodesk Community - AutoCAD
Solid hatch print as lines - AutoCAD Drawing Management & Output - AutoCAD Forums
Solid hatches with transparency print as all black when sending AutoCAD-generated PDFs to physical (paper) printer
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Printing in BricsCAD – Layouts
Solved: Problem: PDF print generates strange lines over hatch objects (ACAD 2012 LT) - Autodesk Community - AutoCAD LT
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Autocade 2D complete course
Autocade 2D complete course
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Printer doesn't print hatch in transparency - Autodesk Community - AutoCAD
Trying to add transparency to a solid hatch - AutoCAD Drawing Management & Output - AutoCAD Forums
AutoCAD 2021 Beginners Course - Zero to Hero Fast with AutoCAD, Michael Freeman