[Bug] Paragraph background color property not rendering

[ShipIM]

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Affected packages and versions

latest

Reproduction link

Import a paragraph with JSON:

[
  {
    "shading": {
      "backgroundColor": {
        "rgb": "#FFFF00"
      }
    }
  }
]

Expected behavior

The paragraph background should display in yellow.

Word example:

Actual behavior

The background color is not rendered.

Actual output:

System information

No response