2014 Ford Escape - Plugs

What would cause the end of my spark plug to destroy its self inside the motor while driving? New plugs mind you. Just changed them a few days prior as well drove about 23 hours straight then all of a sudden I get a code misfire in cylinder 4. It’s a 2014 Ford escape se 1.6l turbo 2wd?

Wrong plug, defective plug, stuck wastegate on the turbo? Do turbos still use wastegates?