Multi-sim not producing shards

Quixotic

I have read a lot on here where people are supposed to get shard drop rates the same when simming 10 battles as when doing single battles or whatnot, but when ever I sim double digit battle numbers in cantina I always get no shards. I've tested this five times now, with no shards dropped on 10, 11, or 12 cantina sims and would really like to know why.