[RSS Feed/News] Condition is silently for if contentcheck is specified

[XenForo]

Reproduction Code
HTML:

<xf:set var="$value" value="{{ 0 }}" />
<xf:if is="$value > 0" contentcheck="true">
    Value is {$value}<br />
    <xf:contentcheck>
        This should not be shown!
    </xf:contentcheck>
</xf:if>

Expected Result
1) No output is generated from this template code (Preferred)
or
2) An error is being shown that is cannot be used together with contentcheck

Actual Result
No error is being shown when seving the template code...

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