I'm pretty sure it's not using 10. It's doing exactly what PFS1 did, 3 per level. So you added 4 XP, which makes you second level, and you'll hit third level at 6 (under PFS1 progression).
So I don't think it's totally broken, just using the old progression. I suspect if you added 2 XP more, you could level up to 3rd with no validation errors.
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