QCAD Professional
Win7 32bit wininstaller
Version: 3.25.2.13 (3.25.2.13)
Internet: QCAD.org
Build Date: Feb 12 2021
Revision: cad2d36
Qt Version: 5.13.2
Architecture: i386
Compiler: Unknown

Andrew,

Break out Manual (B2) on Arc and open Polyline results
seems to depend on the breakpoint picking order.

A segment is broken out when the picking order is in the entity orientation.
The intended behavior.

That differs when the picking order is opposite the entity orientation.
One would expect that the picking order matters when removing
a segment between the picked points.

Example file included

Noticed while merging code to PolyLineBreakSymbol.js
https://github.com/qcad/qcad/blob/master/scripts/Misc/MiscDraw/PolyLineBreakSymbol/PolyLineBreakSymbol.js
Line 300-312 orders cut points on distance from start.
Otherwise, the results where inconsistent.

Regards,
CVH