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I'm having this error show up a bit more frequently than desired in a generator. The subtable has more options than are available for picking. I've tried using shuffle even though it isn't a [!table] pick and it still happens.
When I started noticing it, I threw a variable display line into the display table for the generator. The variable is always there, it just misses it in the subtable call. The call looks correct to me.
Is this known behavior?