1879' really king. This is impossible. Even if it turns to brick, more should drop.

Kbnomoredrama

They turn to brick even when you get them to drop to the side. You should have more to drop, why force people to buy boosters. Ugh just about over this game 

StuckInATree

There's a trick to this to make sure you only get yellow candies from the mystery candy... https://care.king.com/en/candy-crush-saga/level-1879-glitch-or-deliberate