That's interesting! I couldn't get it to return those values myself, but I went with setting the tier to 1 or 2 depending on the number of purchased traits (below 35, it should still count as tier 1, as far as I know - at which point the empowered traits are unlocked?).
Those odd numbers don't even work with the other Artifact functions, so unless there's something I'm missing maybe it's just a bug...
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