The Bug

If the gamerule mobGriefing is false, infested blocks can become their regular version if nearby silverfish are attacked. However, no silverfish spawn from this.

Steps to Reproduce

1. Set the mobGriefing gamerule to false.
2. Place down an infested block, and spawn a silverfish next to it.
3. Attack the silverfish.
4. Using the F3 screen, look at the "Targeted block" information and note whether the block is still infested or not.

Observed Results

The block is no longer infested and has transformed into its regular variant.

Expected Results

The infested block would stay infested when the mobGriefing gamerule is false.