Latest official release (4.0.27) indicates 4.0.27.SOURCE when run

I just upgraded to the latest official release of Zotero Standalone for Linux (Zotero-4.0.27_linux-x86_64). However, when the program runs, it indicates the following:

You are on a custom Zotero build (4.0.27.SOURCE).

Is the version I downloaded really not the official release? What should I do?
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