The woodland mansion has not appeared in my world, I found a cartographer and got the map and the house icon is on it, however it's not in the world. I made another version of the world with the same seed and it appeared on that world. I did some reaserch to see if anyone else had expierenced this, I found one other person but that is all and I do not know if they were on iOS. I also have one reasource pack on but its just coordinates unlocker. Could this have been the reason?