Log Browser: map adds lines between waypoint and the last waypoint (sometimes)

While analysing logs from my recent mapping boat test from Shimane, I've noticed that the Log Browser screen draws lines not only between waypoints (which is very helpful) but also between the waypoint and the last waypoint but only sometimes. It seems related to whether the waypoint was moved.

Below is an example where I moved waypoints 7, 8, 11 and 12 away from the shoreline for additional safety. This resulted in extra lines appears between home and 11 and 12. I'm unsure why 7 and 8 didn't also get lines to home.

I've placed the log file here but it is quite big sorry!: https://www.dropbox.com/s/ijgazuvakcfstlc/00000050.zip?dl=0

Start in the Log Browser screen and reproduce the extra lines using the linked 00000050.zip log, focusing on moved waypoints 7, 8, 11, and 12. Compare the displayed connections with the waypoint data and use the screenshot as the reference; done means lines appear only between intended waypoints and the behavior is covered by a reproducible check.

Written by the indexing model from the issue text.