When a paragraph tag has the localize entry set to false, it is supposed to append '_NOL10N' to the paragraph id on import, as the code to toggle L10N relies on that appended text in the paragraph id in order to know if it is on or off. Not setting this causes saving the file to lose the localize entry.
Example file - source/text/sbasic/shared/03020104.xhp
<paragraph role="bascode" localize="false" xml-lang="en-US">Sub ExampleReset</paragraph>
<paragraph id="" role="bascode" xml-lang="en-US">Sub ExampleReset</paragraph>
*** This bug has been marked as a duplicate of bug 93981 ***