When press the F3 button alternate information pops up on your screen. In the bottom left it says variant. When you point your mouse over a monster egg brick it says so. This is a bug because then people will be able to know when they're about mine a stone that will spawn a silverfish.
MC-67199
Seeing the name of Monster egg stones.
Resolved
Invalid
0
Invalid
The F3 Screen is not meant to be used in Survival, it's a debug screen.