AoF3 2.2.0 - 1.16.3 - Minecraft version
cc-tweaked-fabric-1.16.2-1.91.2 - CC: Tweaked version
Detailed reproduction steps: have a server or lan world with a player having a https://www.curseforge.com/minecraft/mc-mods/get-off-my-lawn claim anchor placed down and have a different player use a turtle to mine blocks in the other players claim. The turtle ignores the claim and can be used to grief players on servers.
The mod Carrier just recently had to implement a check for claim systems so that may be useful info for checking claims. https://github.com/GabrielOlvH/Carrier
Useful information to include:
AoF3 2.2.0 - 1.16.3 - Minecraft version cc-tweaked-fabric-1.16.2-1.91.2 - CC: Tweaked version
The mod Carrier just recently had to implement a check for claim systems so that may be useful info for checking claims. https://github.com/GabrielOlvH/Carrier