Pretty simple to reproduce, just have a relatively fast but wide ship and a slower ship approach each other while both hugging the sun
Doesn't seem to be tied to the latest release candidate
#Ship collision avoidance can override sun avoidance
quartz wagon
lyric forge
Do you have a save file for the above?
quartz wagon
Here's a test save I made that uses a slightly smaller version of the green ship and the same built-in, but it's not quite as agregious as what I experienced in that game
Here are some other tests I ran with strange results
For all of them, I just gave both ships an rts command opposite the sun and made them go towards each other, forcing them both to hug the sun's boundary until they met
It may not all be the same bug but it's strange behavior regardless