flushing for harvest is a giant groupthink myth. it's not real. none of the original scienc-y reasons given for doing it were true once tested with real lab equipment, lol.... that's the funniest part about it. the decades accepted reasons weren't even true... so if that doesn't raise a red flag about integrity of the faux-knowledge, i don't know what would. blind taste tests cannot discern flushed harvest from a non-flushed harvest. outdoor plants are never flushed before harvest and they are fine. testing the bud plant material showed there was no statistically significant difference in composition between flushed and non-flushed.
myth busted...
don't worry about it as long as your plants aren't a toxic mess... the above assumes common sense context of a healthy plant as opposed to a dumpster fire.