[Drag & drop] Preview quirks

[Witoso]

📝 Provide detailed reproduction steps (if any)

1. Drag an image (with disabled cache), and the image doesn't show.

2. To check, in the manual test everything works correctly, in the demos it doesn't, e.g., no bold/lists in table.

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[CKEditorBot]

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[CKEditorBot]

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