u/Sharp-Giraffe-4478

Since past 2 days the leaves are falling off. I have checked roots, I don’t see any rot. In the second picture, the tip of the steam seems to be translucent. This was the first succulent, I ever purchased. It used to be so beautiful 🥲 (picture attached at the end).
I keep them under green sunshade, as here the temperature can go upto 35 degree Celsius.
Could this be the reason?
Btw have repotted it into well draining soil mix. The last pic is when I first got it from the nursery.
Please help.