I tried a lot to reproduce this issue but just couldn’t find a way to do it. So it’s still something we should look into a bit more so we can get a better idea of what’s causing the issue so I can fix it.
When an item is missing from a pack, that package is deemed to be incomplete and is marked for redownload. I can’t tell why in this case the package was not deleted and redownloaded later, as there was no change on this end for quite some time now. The only reason I can think of is when a file can’t be accessed by the program temporarily – this could cause an issue in loading the item, and then the failed access can prevent deletion at the same time. The changes to the PSD Exporter shouldn’t influence this behavior in any way.