I have had no issues wet tumbling...
I shoot dirty brass.... LOL. Clean brass is a waste, OTHER than trying to find it back on the ground from an AR or the like....
I have 4-5 gallon buckets of 223/5.56 brass and I wet tumble it so I can sort it and get lc and r-p brass. But I pretty much clean all my brass anyhow.. some are lazy or don't have the equipment to clean there brass, me I have the equipment to do it so why not clean it.