Hi nikv! I don't know the seasons from you, but some of those lithops seem to be in the period of moulting and perhaps it would be better not to give water. During the moulting, the internal leaves absorb nourishment from the external ones that are gradually drying out. In the last photo, if you look closely you can see the new leaves under the crack
@cooltivar lithops do start forming new leaves in winter but it's just the angle in the last photo that suggests new leaves and these lithops are so water-starved, if you look at the top photo: some of the new leaves didn't even grow enough to break out of those old husks from the previous season. My healthy lithops are busy forming new leaves, but these, I wasn't even sure if the roots were still alive. Lithops tolerate occasional watering in winter