I do have data packs, all from Vanilla Tweaks: anti creeper grief, armour statues, cauldron concrete, cauldron mud, double shulker shells, dragon drops, more mob heads, silence mobs and silk touch amethyst. I also have 1 that isn’t active as it caused a weird visual thing called timber. I don’t think any of them would cause the sound.
The UI on IPads is super small. And the UI slider doesn’t work, and the “Change screen safe area” button and slider doesn’t allow me to expand it to the size of my screen. The inventory in game is also extremely small and makes it difficult to play the game.