My female CBS lost one of it's arms a few weeks back and finally molted sometime in the past couple of days. It regained the arm but it's half the size. It looks kind of weird.
Inverts are like snakes. Once injured or lose a limb they molt or shed faster to help fix the issue. It will be fine next molt. My emerald lost a claw and molted a short time after.
I had a CBS and it got into a fight with my pistol shrimp one night, lost 2 legs, both pinchers, and a few scavenging arms, but the little bounder grew them ALL back! Lol, he left the pistol shrimp alone after that!!!!!!