how old was the tire, how many kms or miles on it, photo?
all that doesnt change the fact that its a drag for you.
and this tire looks very old. maybe I am wrong.
The age of the tire is definitely something to watch out for...
I had a case like that but didn't consider this in the cases of Schwalbe failures. In particular, the tires last long enough that at times when I've bought more than one spare - it put it in storage in my garage. I had a case where the tire was perhaps 10 years old and it had dry rotted in that spot and also cracked. When I wore through a previous Schwalbe, I put on this (old) tire and it failed about 10 miles later. I took that not so much on Schwalbe but more that I had saved the tire for too long.