Just whack a spacer behind it, looks like when you stick a 7 speed cassette on an 8 speed freehub
I fixed the problem by tossing on a 12T small cog, and it indeed works. Didn't have a spacer at home unfortunately, that would've been my go-to solution.
@snottyotter started
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Just whack a spacer behind it, looks like when you stick a 7 speed cassette on an 8 speed freehub