Block4Block 1.6 patch notes:
- AFI (freecam anti-cheat) has been expanded to prevent players from breaking blocks they can't see.
- Configurable explosion immunity for claims.
- Grace period can no longer be triggered by changing a block, such as changing a grassblock to farmland or a dirt path.
- Fixed a bug that prevented players inside their claim from placing buckets with tropical fish, axolotl, cod, salmon, pufferfish or powder snow.

Default config changes
Explosions config:
The following explosives do not break blocks inside claims:
overworld:
TNT, Minecart TNT, Fireballs from Ghasts, Wither attacks and Ender crystals.
the nether:
TNT, Minecart TNT, Wither attacks and Ender crystals.
the end:
TNT, Minecart TNT, Fireballs from Ghasts and Wither attacks.

Claim blacklist:
- iron blocks

No loot on break:
- added gold, diamond and emerald blocks.
- removed magma cream, melon slice, mushroom stew, mushroom, blaze rod, debug stick and honeycomb from the list as they are not blocks.