I created a texture pack on my PC (Windows 10). I uploaded it to the realm on my PC then played it on my Xbox. It did not even load my custom textures. 3 sound effects and one texture is effected to my knowledge. The chest opening effect is replaced with the same effect from Fortnite. The hit sound effect is replaced with the downed sound effect from Fortnite. And the dropped item sound effect is replaced with a (i don't know what) sound effect from Fortnite. The potion of healing texture is replaced with a horribly cropped slurp juice.
This also affected my friend when he joined the realm. Thank you in advance.