Row-spanned cell gets broken down on removing heading section above that cell

[jodator]

📝 Provide detailed reproduction steps (if any)

1. Create a table with 1 heading row an a col-spanned cell below heading section.
2. Remove heading row.

✔️ Expected result

The layout below removed 

❌ Actual result

The cell is broken down before removing changing heading section.

📃 Other details

• CKEditor version: latest master

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