PlainTableOutput does not work with TableColumnResize (not possible to get data from the editor)

[dufipl]

📝 Provide detailed reproduction steps (if any)

1. Enable PlainTableOutput and TableColumnResize (e.g. using GHS-all-features manual test)
2. Add a table and change the width of any column.
3. Try to get the editor's data by editor.getData() or open SourceEditing

✔️ Expected result

Data obtained/source shown

❌ Actual result

Error in the console, not possible to obtain data/show editor's source:

converters.js:98 Uncaught TypeError: Cannot read properties of undefined (reading 'getChildren')
    at insertColgroupElement (converters.js:98:1)
    at DowncastDispatcher.<anonymous> (converters.js:79:1)
    at DowncastDispatcher.fire (emittermixin.ts:241:1)
    at DowncastDispatcher._testAndFire (downcastdispatcher.ts:615:1)
    at DowncastDispatcher._testAndFireAddAttributes (downcastdispatcher.ts:639:1)
    at Object.convertAttributes (downcastdispatcher.ts:666:1)
    at DowncastDispatcher.<anonymous> (downcasthelpers.ts:1248:1)
    at DowncastDispatcher.fire (emittermixin.ts:241:1)
    at DowncastDispatcher._testAndFire (downcastdispatcher.ts:615:1)
    at DowncastDispatcher._convertInsert (downcastdispatcher.ts:331:1)

📃 Other details

• Browser: Any
• OS: Mac OS Monterey

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