A prolonged opening changes temperature and moisture conditions and may allow existing frost to melt. That timing is useful, but it does not establish that the appliance has no separate fault.
What the observation tells you
Check the food-storage implications as well as the water. Wiping the puddle and shutting the door does not reconstruct how warm the contents became. Avoid scraping residual ice or directing heat at the interior to speed recovery.
A useful next step
Close the door normally, protect food as required and follow the model's recovery advice. Report persistent pooling, unusual frost or failure to regain suitable conditions after the incident.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.