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I couldn't see anything obviously wrong with it, but it only has to be a subtle bend or twist of one part of it to throw shifting off. It could still be a useful spare, just not gonna win any sprints (because everyone is sprinting in the 11T trufax)
hippy-
If I thought it was always going to work exactly the same it would almost not be worth replacing as I only use that bike for ultras, audax, light touring, off-road gravel messing around, etc - and spinning out a bit sooner with no 11T just means I can roll down the hills longer. But the risk of failure mid-ride is most likely a lot higher now.
frank9755
As a last resort you could post a picture of the derailleur as seen from the back of the bike, maybe somebody can identify if there's anything wrong with the way you mounted the replacement cages, but I assume you and @hippy have already checked that.
Always disappointing to replace these parts, broke the hydro bladder of my Di2 brifter after less than a 1000 km due to a bad fall, I was a bit upset.