"Mojikumi: line end all 1/2 em + Kinsoku: Hard Kinsoku" is being spontaneously added to Para Styles

Joel, thanks for taking time to reply when you are not even at the application. I appreciate it. And I also appreciate Abhisheks prompt replies, as they came within the hour of posting. Fortunately, this problem isn't urgently causing me an issue, but I suspect it may come to that again. 

None of my files or ID installations are older than 2020, so I don't suspect that's the issue. The only thing I can think of is the possibility of a Word document from the one editor that I work with, though I've been using her files since 2020 and not had this issue until a couple of months ago.

I previously tried the following script that I had ChatGPT write for me, and if failed to run with the following error:

Error Number: 55 

Error String: Object does not support the property or method "KinokuSet"

Line 18:

Source: style.kinokuSet = NothingEnum.NOTHING;

The script follows:

// Remove Kinsoku and Mojikumi from all Paragraph Styles in InDesign
(function() {
// Ensure a document is open
if (app.documents.length === 0) {
alert("Please open a document before running this script.");
return;
}

var doc = app.activeDocument;
var paragraphStyles = doc.allParagraphStyles;

// Loop through all paragraph styles
for (var i = 0; i < paragraphStyles.length; i++) {
var style = paragraphStyles[i];

// Only process user-defined paragraph styles (skip defaults)
if (style.name != "[No Paragraph Style]" && style.name != "[Basic Paragraph]") {
style.kinosokuSet = NothingEnum.NOTHING;
style.mojikumi = NothingEnum.NOTHING;
}
}

alert("Kinsoku and Mojikumi settings have been removed from all paragraph styles.");
})();