It's not "gone" yet, just a hairline crack around the tube across the whole rear side. I only noticed it when oiling the chain. I wonder if the baby seat has contributed tbh.
I rode it this morning, paying attention to any noticeable flex or creaking, and didn't detect a difference.
How did it go? Noticeable ping or did you just see when looking at it at some point?
Bit worried about this happening to mine, especially since I've shoved a 130mm hub in it. Though not sure if this something they fixed with the v4.