Cosmos: List.Contains is not working

[geomtech]

Expected Behaviour - What do you think that should happen?

Find the index of an object in a List of objects through Contains

Actual Behaviour - What unexpectedly happens?

Just make the OS freeze, no exception

Reproduction - How did you get this error to appear?

Not working:

return Keys.Contains(key);

Working:

foreach (var device in Keys)
{
    if (k == device)
    {
        return true;
    }
}
return false;

[valentinbreiz]

Seems related to #1592