Tweening the size of a TextBox while the focus is captured causes text to be improperly scrolled off-screen until the user either manually scrolls to the front, or the focus is lost, as shown in the video below.
Video
Repro File
TextScrollingBugRepro.rbxl (54.6 KB)
Expected behavior
It makes sense that the text scrolls to the end to reflect the cursor position, however as the TextBox size increases, I’d expect scroll would be influenced as well, and fit the text within.