Filled a bug report. This is the link: 
https://bugs.documentfoundation.org/show_bug.cgi?id=104194 

Found another bug, that is similar but not equal: 

 bug 76296 <https://bugs.documentfoundation.org/show_bug.cgi?id=76296> titled 'FILEOPEN: Open or import of MathML file does not write ~ or ` for the <mspace>



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