The tail not showing is actually a regression from a separate release unfortunately. A fix is in and will be in next week’s release.
Sorry that you had to run into this error. Good news is that onBubbleAdded API is supported in the latest versions of Roblox iOS app, but unfortunately about ~20% of users are still on an older version. This should resolve in the coming weeks as users upgrade, and we typically force upgrade older versions after a few weeks.