The default for Split command should be line middle point. Not sure where the value comes from but it fails on some segments due to being outside or creating a minimum segment violation error. For those struggling with this, the workaround is to create new lines or arcs to use in the split, trim commands.
@dan_szymanski
![TP086.gif TP086.gif](https://forums.autodesk.com/t5/image/serverpage/image-id/372376i8EEFEFFE7136F198/image-size/large?v=v2&px=999)