Deprecated function not working in Gutenberg

Looking at the documentation from https://developer.wordpress.org/block-editor/developers/block-api/block-deprecation/

I think you may need the following 

 migrate( { text } ) {
            return {
                content: text
            };
        },

So in your case:

migrate( { avatarSize } ) {
            avatarSize: {
                    type: 'number',
                    default: 70
                }  content: text
            };
        },

Hopefully points you in the correct direction

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