[1.187.x] Mineral signals might not disappear sometimes
Maybe it's a new feature that wasn't properly announced...
Easy Start - Earth.
1. Go to ore detector near the base and power it off.
2. Leave cockpit and draw hand drill
3. Stand for about a minute while holding a drill
4. Run away until the signals are about 1 km away, still holding a drill
5. Sheathe a drill. The signals are still visible.
Signals persist after dying, but vanish after world reload.
Can also be reproduced by a grid with an ore detector.