When you have a wall right up against the claim, and someone builds a palisade off the claim, waits for it to fully dry, and then hand bashes it with massive strength, they can bypass the claim shield and just ignore the siege mechanics.
I keep seeing newbies losing bases to this, so what about tweaking pclaims slightly? Make it so that palisades under claim shield are unaffected by cascade (if) the palisade cascading it is not on the claim.