Silverfish spawn in the bottom-west-north corner of infested stone

The bug

When breaking infested stone, silverfish spawn in the most negative corner of the block, rather than being centered.

How to reproduce

1. Grab some infested stone from the creative inventory
2. Place it
3. Switch to survival mode and break it
→ Silverfish appears in the bottom-west-north corner (i.e. the lowest coordinate corner)