urgent help needed .what’s wrong with my string of pearls? i watered it just a few days back but some of the pearls have started drying up while the others are completely firm. i have killed this plant multiple times in past by overwatering.

now i check the pearls before watering but even after watering some of them, look dried up. the variegated one dried completely even after i watered it, don't know what's the problem 😔