Tomatoes Splitting AFTER Harvesting?

in Fruit & veg
Harvested quite a lot of Toms yesterday, a mixture of Gardeners Delight and Alicante. All looking lovely, no blemishes and nice and firm. Put them in the colander and rinsed them as normal and left it on the draining board. Went i went to pop them in a bowl and into the fridge this morning a dozen or so of both varieties had split. Quite alarmingly so. Anyone ever known this? Could it be rinsing them with cold water shocked them or something?
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Keeping the calyx on, as suggested, might help though that can be annoying in its own way! (Or grow varieties with thicker skins)