Yep, had this on B-747-136 once. Straight out of the hangar...ready to fly....lol.
In 'E' zone got a call to come and look pre-engine start...sure enough...a whole 3-seat row unbolted to the floor and when pax sat down realised they had more 'recline' than they were used to!
Had to be seen to be believed.
Whole row removed and pax/luggage removed....3 unhappy teddies not going to Miami! ;-) as flight was full.