My understanding here is that the *masorah* here is relating to the word שְׁפט / שְׁפוֹט without any prefixes.

That word does appear only twice in Tanach: here (spelled defective) and plene in [II Chronicles 20:9][1]

>אִם־תָּב֨וֹא עָלֵ֜ינוּ רָעָ֗ה חֶרֶב֮ שְׁפוֹט֮ וְדֶ֣בֶר וְרָעָב֒ נַֽעַמְדָ֞ה לִפְנֵ֨י הַבַּ֤יִת הַזֶּה֙ וּלְפָנֶ֔יךָ כִּ֥י שִׁמְךָ֖ בַּבַּ֣יִת הַזֶּ֑ה וְנִזְעַ֥ק אֵלֶ֛יךָ מִצָּרָתֵ֖נוּ וְתִשְׁמַ֥ע וְתוֹשִֽׁיעַ׃

where, interestingly, it would seem to be a straightforward noun (equivalent to the word מִשְׁפָּט).


  [1]: https://www.sefaria.org.il/II_Chronicles.20.9?lang=bi