I feel like you might've had the Hostile player set when you placed them using the Unit Palette. If that's not the case, go into Data > Units/Structures > Mineral Field > look up "neutral" or "hostile" and get back to me. You might have an error in the default AI response for this object, since all resources default to neutral.
Quote. I did this mistake once when developing my AI. I wondered for a while why it didn't work... till I found this :P
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Battle.net wants to call me InsaneMst, Insane... but you should call me InsaneMonster!
Battle.net wants to call me InsaneMst, Insane... but you should call me InsaneMonster!
Author of InsaneAI library, InsaneCredits library, InsaneDebug library, InsaneTransmission library, InsaneUI library and InsaneBriefing library.
Author of Mercenary Business - Top 10 Rock The Cabinet 2017: Co-op edition.