IME, my nems had exhibited similar tenticle distortion like yours due to being beat up against rocks or other things via being blown around in the current. I have observed a perfectly formed RBTA be placed in a new spot in the tank and the new flow caused it to bash the tenticles against a nearby rock. Upon healing the bumps and tears in the flesh the end result looked like yours.
Essential its like scar tissue. As far as negative affect, I observed none.