I am sorry you did not like the new stitched strap. I have the new one, I like it a lot, but this is personal preference. I thought that this wasn't an option.So when I brought it back in Jan 2023, they ordered a replacement strap for me as a "one time" courtesy. They were quick to point the blame to me, though, and say it was due to hand sanitizer use or humidity or something like that.
The replacement strap that just came in a day ago was stitched. However, it looked so awkward with the pochette (far too long and thick) that I asked them if they could replace it with the original strap. They are supposed to but they told me that, if this issue happens again, I have to pay for a new strap.
It definitely looks like a glue issue to me. The original 2006 strap and I were through a lot and I never, never had an issue with it separating. I had to replace it because the knotted portion ripped off.
The patina is already quite dark, I guess that they accused you based on that. But that in itself doesn't mean anything.