At the risk of being a nuisance and, I’m sure this has been discussed before on this thread, but there could be an explanation for large amounts of condensation ice breaking off the roof of both wings simultaneously – vibration through the wing caused when either the landing flaps were extended or the gear went down.
The ice would not melt when falling into the fuel due to its temperature. When the pumps started sucking the ice was drawn to the filters.
i.e. The ice was nothing to do with water in the fuel which was loaded.
Just a thought.