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Answer
According to the Nordic DevZone there are mainly two potential issues leading to a short on one of the SWD signals:
- ESD issue, likely when connecting an SWD programmer to the SWD signals.
- Connecting an SWD programmer while the target board is not connected to supply voltage.
Please make sure proper ESD precautions are taken into account (ESD wrist-strap, ESD base/mat) as well as make sure to first connect the supply voltage and then the SWD programmer.