Reverse Layer Order Bug
First off, thank you so much for this. I hate that Sketch sorts Artboards from the bottom to top. So being able to reverse them helps.

However, I've noticed a consistently inconsistent bug. When sorting, sometimes it skips some of the layers you've selected, mainly the first few (which should be last in the order). It mostly happens when sorting a few Artboards (3 - 5) or a lot of them (20+). It happens about 50% of the time. And like I mentioned, it only misses the first handful, even if a bunch are selected.
