So, today I was surprised to find ice in a can of coke that has been in refrigerator > 0C temperatures for more than 2 weeks.

~two weeks ago I placed it in the freezer to cool, but ended up forgetting it until the next day. The next day I remembered, but by then it had frozen and bulged. Nevertheless, I moved it into the refrigerator.

Nothing else in the fridge has any ice, and it wasn't located in a particularly cold part of the compartment. Is this a case where the bulged (and thus enlarged) container created negative pressure when the ice attempted to melt and hence raised the melting point of the rest of the ice?