Created attachment 180550 [details]
Rectangle with glue point in center and 180 deg leaving direction
The ODF standard defines the attribute draw:glue-point-leaving-directions in section 19.173 part 3 ODF 1.3. It allows to specify the direction in which a connector leaves the glue point. It applies to glue points, which are defined in the <draw:enhanced-geometry> element of a Custom Shape.
The attribute is not implemented in LibreOffice.
Open attached document. It specifies a leaving direction of 180 deg for the rectangle. You can edit the file markup and set other values for the directions. Regardless of the value, the leaving direction is always to right.
The fact, that the attribute is lost on saving, will be reported in a separate report.