Does Wehlen cut off Rizia if you fail to get them to willingly return Zille?

Playing 3.1, and I noticed halfway through turn 9 and into turn 10 I got negative energy per turn. Around -7. So I went to check what went wrong. Part of it was increased consumption from consumer industry boom and increased industrial production. However I also noticed that in the breakdown of the energy loss, Wehlen's oil is missing at turn 10. Is smolak really that salty in 3.1 or is this a bug?