I haven't figured out what exactly is causing this but I found a possible solution: install the ARTEFACT SPAWN REBALANCE mod:
The EXP modpack use to have similar features, making high-tire artifacts only exist in northern regions (Zaton, Jupitor, etc.). The artefact spawn rebalance mod does the same thing. With this mod it's hard to find anything useful south of Rostok though.
zkzstt
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