The area used by the keyboard is incorrectly reported when a Flickable is in place. This is causing it to hide any cursor that is in a TextArea as it is not possible to automatically adjust as a result.
The example attached has the solution in place to move the Flickable up when needed to show the cursor. To reproduce click inside TextArea editable 11 and then press enter and the cursor will end up under the keyboard.
If you scroll to one near the end, such as TextArea editable 17 and do the same, then it works fine.