When a TextBox is focused, and a TextButton is on top of it (properties Active and Selectable are true), clicking and dragging the cursor while still in the TextButton will highlight the text from the TextBox underneath.
The input does not sink through the TextButton if the TextBox is not already focused.
The gif below shows the TextBox gaining focus and the text selection input sinking through the TextButton.
And the gif below shows how it does not occur if the TextBox is not focused.
This occurs every time, and I’ve attached a repro for this bug.
TextBoxTextButtonRepro.rbxm (4.4 KB)