It has happened before in Oz about ten years ago. They inflated when the floats were armed on finals to a rig in the middle of the Timor Sea. No replacement floats bottles available so eventually it was flown back with them still inflated, some 180 n.m..
Pretty wet in that part of the world and it was believed that the co-pilots collective switch assembly had got rained on before the flight. They now have a plastic sleeve over them on the ground to keep them dry.
It didn't make the papers then. No reason why it should now.