Is that center-most clump hat fell off? That is a shame, it looked so good in 1st photo. I think you overwatered it - can't see other reason for it to fall off. I see there is lots of perlite (?) in there, but see also lots of 'dark' particles; is that bark? What else is in the mix? How often do you water? How do you decide when to water?

the whiteish stem poking up from the clump is where it came off, thankfully I still have the rosettes in the centre. Someone was taking care of my plants whilst I was away for 2 weeks so it’s possible the damage happened then. But I water them once a day, giving them a small spray so I wouldve hope that wouldn’t be overkill. That is perlite and I believe the dark lumps are bark. I use the Westland cactus and succulent mix with equal parts perlite. I’m surprised if I have been overwatering as my Rosettes have shrunk or disappeared signifcantly as leaves keep shrivelling and drying up

Good info from Kara, but did you say you water it once a day? That is way too much...I never spray my plants, they don't like humidity, just a deep drink once in awhile. Like once every 7-12 days, when soil is truly dry.

Thank you Lisa. I only do a small spray but I wasn’t really aware of the humidity effect, the soil is bone dry the next day so I thought it’d be okay, it’s working amazingly for every other succulent I own! But I’ll take your advice and hope I can revive it.

Watering every day "just a little" keeps your mix constantly moist, especially if it contains bark and/or other organics. Succulents should be watered thoroughly when is time to water, and then mix should dry up before next watering. How do you know that it is 'bone dry'? It needs to dry up down to bottom - easy way to find out is to use bamboo skewer. Insert deep into mix, leave few min. When pulled out and it is dry, time to water. Otherwise, wait and check again before watering.

Spraying succulents - hope you mean soil, not necessarily plant itself, doesn't do much good. It is just "teasing" plant.