Cold air meeting warm humid air can create a visible mist. That observation alone does not identify a refrigerant leak.
What the observation tells you
A suspected puncture, chemical release, unusual smell or loss of cooling is a different situation and needs the manufacturer's safety response. Do not sniff closely into openings or touch pipework to investigate. Ordinary visible mist cannot certify the absence of another problem either.
A useful next step
Describe the circumstances and any accompanying damage or cooling change. If sealed-system damage is suspected, obtain appropriate professional advice and keep ignition sources away as the model guidance requires.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.