Caret position keeps jumps down inside inline_boundaries_selector elements with empty lines

[Amdoun]

📝 Provide detailed reproduction steps (if any)

Please provide the steps to reproduce and if possible a minimal demo of the problem via fiddle.tiny.cloud or similar.

1. Add an element that has the property inline_boundaries_selector (For example, Code)
2. Add a few line breaks with SHIFT+ENTER (Do not add any text in the new lines)
3. Navigate down that element with the arrow key and navigate up in order to check where the caret is placed

✔️ Expected result

The expected result is that the caret should be located on the specified line without it changing its position by its own.

❌ Actual result

Check this video:

Screen.Recording.2024-03-15.at.08.29.26.mov

From the 0:10 mark, all I did was press the UP arrow key and it created, then it seemed to have added a new line break by its own. Then the caret kept jumping to the bottom position if I tried to move it up. From 0:11 and onwards, I was only pressing the UP arrow key and the caret kept trying to position itself in the end of the inline element.

📃 Other details

• Browser: Chrome
• OS: MacOS
• TinyMCE version: 6.8.3

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