No you did fine. I've seen this happen on occasion...here is a short video...
There is a small spring loaded finger on the central chronograph wheel (the one with the seconds recording hand on it) that flips and intermediate wheel once per minute, and that in turn flips the minute counter. You can see in the first clip that the finger fails to move the intermediate wheel, and instead the spring collapses. The next clip shows the underside of that wheel, and how the finger and spring work. The last clip is with a test wheel from another movement I was servicing at the time installed, and it trips the minute counter fine.
It's possible that the spring for the finger is weak, and this is why the minute counter fails to advance. It will requires a new chronograph wheel at service. This in itself will not cause any additional damage to the watch or movement, but since you are already at a point where the watch should be serviced, you could send it in - up to you.
Hope this helps.
Cheers, Al
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