Not sure why this issue has occurred, but I've had over 1000 nether speed runs with 0 fortresses. At first I thought it was just bad luck, but I've been to now 5 separate worlds in creative and searched for 2+ hours on each using chuck base and even getting rid of all the lava and netherack with still no fortress in sight. I've been from end to end searching these maps with nothing to show for it. I don't know if this is for everyone, or if this is only for the Xbox 1.17, but it has really ruined the game for me.