That's more of a Nike being cheap issue than a QC issue. The toe vamp is much smaller now so it ends in the middle of the mudguard/toetip. And because the leather they used on these OW50s are much nicer/softer than the usual leather they use on the lifestyle Dunks, it'll be prone to crumpling up like that. So it's a compromise you'd have to take - harder leather on the mudguard so you won't be prone to that issue, or softer leather on the mudguard so you're prone to that issue.
The toe vamps used to extend all the way down to the soles and the mudguard was just an additional layer added on top. So the red is the size of the toe vamps now, whereas the green is where it used to extend to ages ago: