Try a relog just in case. Also sorting the device list puts things back in the correct groups. A few seasons back I was forced to recycle and respawn a ship that did have an alien core but was still draining power. <–Last resort
@RexXxuS I have someone else telling me that their NPC Core doesn’t give unlimited fuel either.
Did eleon do something to NPC Cores??
Edit:
The other person made a mistake which was unrelated to this apparently.
But I’ve been told that going into the control panel and putting the core into a device group should fix this issue.