Probably something to do with Softcore mod. I've seen this mod configuring traders so custom ones often break.
It was TGC conflicting with Realism's "Hazard Zones". Removing TGC or disabling hazard zones fixes the trader. Softcore works fine with Painter. All other realism settings work fine. New/previous profiles or clearing cache didn't matter.
Having an issue with this trader. Nothing is show up in the trade menu. Quests work fine. I am able to buy Painter's item from the flea market, but not from the trader menu. TGC, Mag tape, and black core are all loaded after Painter. Other modded traders work fine. I am using version 1.1.4 extracted via 7-zip.
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