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Currently my ship docked VORB, and nav shows a derelict ship on map panel before undocking VORB, that derelict ship will disappear on nav map immediately if undock from VORB, still nav sensors panel show that ship image.
Also, I tried SFFWDed and found another derelict ship on nav map and targeted it, then undocked VORB, that derelict disappeard.
No Mods.
Save file (before undocking VORB);
https://drive.google.com/file/d/1UWuemjR_WkUCOjhTvonIXJiWr0ioZwFk/view?usp=sharing
after undocked
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I agree that's a bit confusing!
Though after looking into it, it appears the issue is related to the direction your ship is pointing.
Your optical sensors are much stronger in a line directly ahead of you or behind you than they are to the sides. And when you're docked, your ship is pointed almost perfectly away from that target.
When you undock, your angle changes just enough to lose that sensor boost, and the blip disappears.
However, if after undocking, you adjust your rotation slowly to point directly at (or away from) where it was, there's a small angle where it will appear again:
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Thank you for reply! Now I understand, this seems TIL moment for me after over 600 hours played.😆