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the tiles I had upthread (30x30cm) were sealed on top, but not the edges as far as i could tell/remember - was recommended to seal with a layer of polyurethane type stiff (which i did not do, of course..!).
for what it's worth, the folks that bought the flat from us had a very specific idea of what they wanted which involved taking the floor up entirely (bit of a shame really, think of materials/sustainability, as we were only there a couple of years)
hvsds
Is modern Cork sealed at the edges?
My memory growing up was that water gets between the gaps then makes the tile swell from the edges.