Default RichText Editor custom block fails validation

I tested both example from docs and your example. Both work, so docs example is not broken, as I previously assumed. Something else is the problem. Perhaps you started with one version of the block and then renamed something in code, or accidently added something. Enter code editor instead of visual editor in block editor options and check your block code. If that was an error, please edit original question with adding block code for future reference of all readers.

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