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We've been seeing this error happen recently, but haven't been able to debug it yet. Are you able to view the query in GrowthBook and copy/paste the JQL into Mixpanel directly? That might be able to give you better error messages about what's wrong

I just get the same

Precondition Failed

when I do that unfortunately.

Would you mind sharing the JQL with us so we can see the raw query? Happy to receive it via DM if you would prefer.