Realm chunks missing, Realm Destroyed, Mismatched Biomes

Today I was playing on a realm owned by my friend. I left, and five minuted later when I went back on, it took suspiciously long to load. When it did finally load, I got multiple notifications that all of my animals were falling out of the world. Once leaving my Minecraft house, I soon discovered that our entire realm had been plagued by gigantic 20 by 20ish (I didn't really count but they were huge) giant holes that went all the way down and through the world. All of our built structures we're destroyed, animals were killed, friends who were previously in the nether were stuck there, coordinates had been disabled, and it seemed that multiple biomes had randomly been meshed together. For example: Our realm was in a plains area surrounded by spruce wood forests, and the nearest "ocean" was at least 2,000 blocks away. And suddenly, our realm was filled with giant chunks of deep ocean going all the way down the the bottom. Our village was merged with a desert. There were random trees planted where there was previously an empty field. Month's worth of work had gone down the drain in an instant. We hoped that after a few hours the realm would go back to normal- but no, It is still completely destroyed. We're playing on different forms of IOS devices: School-issued IPads, personal Iphones, etc. No computers, laptops, switches, etc.