RSRP-469234: EditorConfig property "xmldoc_indent_size" has no effect

My EditorConfig file contains the following:

[*.{cs,csx,vb,vbx,fs,c,cpp,h,xaml,htm,html,cshtml,vbhtml,js,ts,css,scss,less,sql}]
indent_size = 4

[*.{cs,csx}]
xmldoc_indent_size = 2

The ReSharper options window correctly shows the overridden value of 2 in tooltips in the XML Doc Comments pane. The File Formatting Info window shows both settings as active (not strike through) and an overall indent setting of 4 spaces. I think this is also ok because it makes more sense to show the C# setting here.

But the actual idention used by the "Build-in: Full Cleanup" Code Cleanup is 4 spaces for the XML documentation. For example, the following code is changed to an indent size of 4 after the cleanup:

        /// <summary>
        ///   Summary line
        /// </summary>
        /// <remarks>
        ///   <para>Some longer text.</para>
        ///   <para>Some other longer text.</para>
        /// </remarks>
        public void DemoMethod()

Tested with 2018.1 EAP 8

Btw, not related to the issue, but why doesn't this property (and similar indent related properties) allow a "resharper_" prefix like most other custom ReSharper properties?