and D2 are failing all trials in the file.
It boils down to:
A) With an open polyline:
- An ending node ... Best practice is Delete Node (OD)
- Cut up (DI) at vertex and delete is the most certain option

- Break out Manual (B2) knowing the orientaion.
B) With a closed polyline:
- Cut up (DI) at vertex and delete is the most certain option

- Break out Manual (B2)
Bug report at:
https://www.ribbonsoft.com/bugtracker/i ... sk_id=2176
CVH