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Self XSS vulnerability in editor #601

Description

@FlyInk13

Describe the bug
There is a self xss vulnerability in the editor

To Reproduce

  1. Open url: data:text/html,<body contenteditable>test1<img src=1 onerror=alert() />test2
  2. Select all content and copy
  3. Paste in editor https://www.blocknotejs.org/

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