MIGX rich text formatting has disappeared since upgrade to MODX 3.0.1-pl

I applied this.renderFirst and it was OK. But I added a link in richtext and there was a problem. You can’t save the MIGX template variable in while editing the document. An error appears:

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How to fix it? Obviously I can remove this.renderFirst but then you can see the unformatted richtext code in the column.
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