Splitting cells destroys the table layout

[Comandeer]

Type of report

Bug

Provide detailed reproduction steps (if any)

1. Open https://ckeditor.com/docs/ckeditor4/latest/examples/table.html
2. Split the first cell in 2011 column ("$44,626" one) horizontally.
3. Split the cell on its right vertically.
4. Split the cell below it horizontally.

Expected result

Table layout is preserved after the split.

Actual result

Table layout is destroyed.

Other details

• Browser: all
• OS: N/A
• CKEditor version: 4.10+
• Installed CKEditor plugins: tabletools