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@absurdbird
Viewing on my phone so wasn't sure about shoulders.
As with many failure modes this one would have been progressive until it reached total failure but the failure started theoretically at least, as soon as the bolts weren't tightened sufficiently.
If there was a quiet part of your commute or you ride this bike on quiet lanes you would probably have heard creaking.
If it creaks check it.
You should check your chainring bolts regularly especially on a commuter.
Grease the threads and tighten up really well. If they're decent quality steel bolts you won't strip them.
Some people loctite them.