I think your issue may well be this: https://starmadedock.net/threads/ships-dont-spawn-but-diamonds-do-for-a-few-moments.28304/
Like in this video?
https://www.youtube.com/watch?v=egesWW1C--4
(saw your post to AndyP on the right hand of the forum thingy).
Like in this video?
https://www.youtube.com/watch?v=egesWW1C--4
(saw your post to AndyP on the right hand of the forum thingy).