The attached file contains only 2 hatch made with Hexagons pattern:
1) A2013: if I use the command Hatch > Custom I see many unused patterns (I think from Microstation), see image
2) Bricscad (all): same command I do NOT see the unused patterns
3) A2013 + Bricscad (all): if I use the command -Hatch (not GUI) _p ? > I do NOT see the unused patterns
4) AutoCAD 2019: I get Fatal error on open (not solved!!!)
9) Question: How can I clean all the unused patterns?