Platform saddles for these things are quite buggy on mobile/UME.

When getting stung by jellyfish,i got teleported to the middle of the map on the sky, only standing on a model of the saddle without my mosa. I dismounted, fell, died, tried finding my mosa, its just gone. This can also happen with plat quetzals upon being submerged, so in general, dont platform saddle flyers and aquatics