Would a Moon made of water pose a threat to Earth during eclipses?

Assume that our current Moon is replaced instantaneously by a moon made entirely of water but of identical mass. This is carried out by an incredibly powerful passing alien who is driving drunk and wants to have a laugh.

Before it had time to evaporate could it act as a lens during solar eclipses and focus the Sun's rays dangerously on Earth? Specifically if it was transparent enough, how could we determine the focal point?

I know that the focal point of a sphere is somewhat fuzzy but I don't know how this would appear on Earth or how a possible transition between ice/water at different depths and therefore pressures would affect things.

The refractive indices of ice and water are given below. I don't know if they are pressure-sensitive.

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Would a Moon made of water pose a threat to Earth during eclipses?

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