odd textures appear after resuming game

weird textures loaded in in place of the normal textures for different types of blocks? i’m completely confizzled with this. i believe to recreate this i was in a normal multiplayer world, swiped up on my iphone 13 from the bottom to put minecraft aside so i could check a text message, then opened it back up , leaving me where i was. upon pressing resume game, the following happens, as seen in the attached video. i open app switcher in the middle of playing minecraft the time, this has only happened once.