The destruction gadget from building gadgets 2 is able to bypass claims.

I believe this is a known issue... claims cant (and wont) protect against all modded items. You can remove the destruction gadget recipe with kubejs (and delete the gadget in players inventories with commands)

kubejs>server_scripts>mods>buidlinggadgets>recipes.js and duplicate the event.remove line and change the id to reflect the destruction gadget