Persistent bug when saving jpg files stating wrongly file in use

What is strange? And it is not a claim but a fact.

For example, when I try to save a jpg file, say 1.jpg, Photoshop first creates a file tempname.tmp in the relevant folder. It then deletes this tempname.tmp file and saves the 1.jpg file. That is the process every time when successfully saving the file but when there is this error, the file tempname.tmp stays on the hard drive in the folder and the file 1.jpg is missing in the folder.

These three images demonstrate this bug in action: screenshot 1 is the error, screenshot 2 the .tmp file created, and screenshot 3 the original .jpg file.

I will upload screenshots to demonstrate this FACT and the script but the script is irrelevant (besides being used as an attempt to find a workaround for this bug) because it happens whether I use the script or not.

<javascriptresource>
    <name>$$$/JavaScripts/Save As/Menu=Save file</name>
    <category>Scripts</category>
</javascriptresource>
#target photoshop

var data = GetDataFromDocument(activeDocument);
var jpegExtension = '.jpg';
var jpgFile = data.folder + '/' + data.fileName + jpegExtension;

jpgSaveOptions = new JPEGSaveOptions();
jpgSaveOptions.embedColorProfile = true;
jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
jpgSaveOptions.matte = MatteType.NONE;
jpgSaveOptions.quality = 12;
activeDocument.saveAs( File(jpgFile), jpgSaveOptions, true, Extension.LOWERCASE);

///////////////////////////////////////////////////////////////////////////////
// Function: GetDataFromDocument
// Usage: pull data about the document passed in
// Input: document to gather data
// Output: Object containing folder, fileName, fileType, extension
///////////////////////////////////////////////////////////////////////////////
function GetDataFromDocument( inDocument ) {

	var data = new Object();
	var fullPathStr = inDocument.fullName.toString();
	var lastDot = fullPathStr.lastIndexOf( "." );
	var fileNameNoPath = fullPathStr.substr( 0, lastDot );
	data.extension = fullPathStr.substr( lastDot + 1, fullPathStr.length );
	var lastSlash = fullPathStr.lastIndexOf( "/" );
	data.fileName = fileNameNoPath.substr( lastSlash + 1, fileNameNoPath.length );
	data.folder = fileNameNoPath.substr( 0, lastSlash );
	data.fileType = inDocument.fullName.type;
	return data;
}