A DESCRIPTION OF THE PROBLEM :
Use a TextArea an enter

Hello this
is a
test

Then place the cursor behind "a" and press backspace four times so that the text looks like this:

Hello this

test

The problem is now that the caret is displayed behind the "Hello this" instead of in the empty line. And when you press a key the character is displayed at the correct position, i.e. in the empty line, not where the caret is. So the only problem is that the caret is displayed at the wrong position. Typing works correctly. I.e. if you don't look at the screen everything works correctly. The only problem is that the caret is displayed at the end of the first line instead of the start of the second line in this example.

REGRESSION : Last worked in version 8u221

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use a TextArea an enter

Hello this
is a
test

Then place the cursor behind "a" and press backspace four times so that the text looks like this:

Hello this

test

The problem is now that the caret is displayed behind the "Hello this" instead of in the empty line.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The caret should be displayed in the second line, the empty line. Because backspace was pressed only four times and there were four characters.
ACTUAL -
The caret is displayed at the end of the first line instead.

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Just use a TextArea. You can even use the preview mode of the Scene Builder to reproduce the problem.
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CUSTOMER SUBMITTED WORKAROUND :
I haven't found a workaround yet.

FREQUENCY : always