I never lost a tip on a landing saw that cut only skidded logs full of dirt. You would expect a tip failure in those conditions.Same here, and especially with a chain that's not right for the species of tree or the wood is frozen.
Although I never "logged".
I believe what happens is the sprocket cracks after so many cycle of cold snow meeting warm sprocket causing the tip to puke. That's just an idea, I haven't any concrete proof of that.