Using OOo 3.0.1 fr
(don't know the exact names of english menus; my translations may not be correct.)

*Open any Draw file (new or existing).
*Right-click on a blank part of the page ; choose "capture lines>capture lines
visible".

*Right-click on a blank part of the page ; choose "insert capture line".
*In the modal window, select "vertical" or "horizontal"; any position.
*the capture line appears. You can move it correctly.

1st problem: editing
*Right-click on the capture line ; choose "edit capture line".
*the modal "new capture line" appears. IT IS THE WRONG WINDOW !? The line isn't new.
*Of course, if you use this window, ANOTHER line will be created.

2nd problem: deleting
*Right-click on the capture line ; choose "delete capture line".
*Nothing occurs. The line stays.

The same bugs exist in 3.0.0 (m9).

They were not in 2.4.1