If a player uses a piston, they can move blocks around the arena, any blocks moved do not return to the original state when the arena ends.
Background
Bug report
MobArena version: 0.99
Server version: Spigot 1.12.2 #131
Plugins: WorldEdit, MobArena
Details
If a player uses a piston inside the arena (they may have brought it in using the My Items or crafted it) they can move blocks around the arena, any blocks moved do not return to the original state when the arena ends.
Players can use this to escape an arena if it is not surrounded in bedrock, obsidian, border, or another immovable block
If a block is placed in the position that the arena block will be pushed to. The player is able to break the block after it is pushed, and the block they placed is unbreakable.
If a creeper blows up a piston in action it can result in the piston turning into a arena block (stone) and the piston head also turns into an arena block (piston head)
(This is with soft-restore: true)
Nesseley
commented
6 years ago
Summary
If a player uses a piston, they can move blocks around the arena, any blocks moved do not return to the original state when the arena ends.
Background
Bug report
Details
If a player uses a piston inside the arena (they may have brought it in using the My Items or crafted it) they can move blocks around the arena, any blocks moved do not return to the original state when the arena ends.
Players can use this to escape an arena if it is not surrounded in bedrock, obsidian, border, or another immovable block
If a block is placed in the position that the arena block will be pushed to. The player is able to break the block after it is pushed, and the block they placed is unbreakable.
If a creeper blows up a piston in action it can result in the piston turning into a arena block (stone) and the piston head also turns into an arena block (piston head) (This is with soft-restore: true)