Commented Unassigned: Corrupt xlsx on phoneticPr attribute [12784]

Using npoi 2.0.6.
I open an existing xlsx file and save it to a new location.
When I open the new file in Excel I get an unreadable content error.
The original file has the following element in the worksheet <phoneticPr type="noConversion" fontId="0"/>
In the new file the fontId is lost and we have the following element <phoneticPr type="noConversion"/>.
If I edit the file and either remove the element or reinsert the fontId attribute the file will open fine.

Is there any workaround for this?
Comments: ** Comment from web user: tonyqus **

This requires a core code change.