I think this may be one of the rare cases where indoor cacti get sunburned because there is a lensing effect with glass between them and the sun. Normally it's really hard to sunburn indoor cacti, and it should be impossible if they are well grown to start with. I agree, get them out of the bottle, find pots with holes, repot, and wait at least a week to water for the first time.
Whoever put together that arrangement did not expect or plan for the plants to survive long term there. Some people treat succulents like cut flowers, as something to harvest and arrange and then dispose of when they inevitably wilt and die.
