Remove/stop 'redactor-inline-converted'
Not a solution, but I strip it out as part of a cleanup macro that runs on body text.

{% macro cleanup(string) -%}
    {%- if string|length -%}
        {{- string|typogrify|replace('&lt;p&gt;&lt;br&gt;&lt;/p&gt;','')|replace('redactor-inline-converted','')|raw -}}
    {%- endif -%}
{%- endmacro %}