Need more info, otherwise were just guessing. I'd speak with the mechanic for sure.
Did the chain just derail and is fine, or did it break, or is is split at the connectorlink (rivet, clip-type ect)?
1) Could lead one to believe the chain wasnt tightened properly
2) Seems like bad luck
3) Could be both, but its unlikely the shop should have disconnected the chain, theres no need to.
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