Imprinting free curves on a surface results in crash to desktop

Trelis Version: 17 and 20
Platform: Windows

Every time I ask the software to imprint a curve on a solid it crashes to the desktop.
Current work around has been to simply cut the solid instead and follow up with an imprint/merge to generate the local definitions I need.

This is no longer viable to carry out good blocking around blades/airfoils for CFD work.