We cannot successfully set some TextFrame.textRange.characterAttributes after the TextFrame has been resized using TextFrame.resize.

(Tested on MacOS 15.4.1 Adobe Illustrator 29.5.1)

Steps to reproduce:
1. Create new document
2. Run the below script

Expected Result: all tests passed and no alert message appears.

Actual result: Failed to set characterAttributes.size to 12.

Script:

(function () {

    var doc = app.activeDocument,
        textFrame = doc.textFrames.add();

    textFrame.textRange.contents = 'Hello.';

    textFrame.resize(200, 200);

    textFrame.textRange.characterAttributes.size = 12;
    if (textFrame.textRange.characterAttributes.size !== 12)
        alert('Failed to set characterAttributes.size to 12');

})();

NOTE: some other character attributes are "unsettable" also, eg. leading.