Only allowing 'not attempted' when CMI has not been initialized

package.json

@@ -1,6 +1,6 @@
 {
   "name": "scorm-again",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "description": "A modern SCORM JavaScript run-time library for AICC, SCORM 1.2, and SCORM 2004",
   "main": "dist/scorm-again.min.js",
   "directories": {

src/cmi/scorm12_cmi.js

@@ -400,10 +400,16 @@ class CMICore extends BaseCMI {
    * @param {string} lesson_status
    */
   set lesson_status(lesson_status) {
+    if (this.initialized) {
+      if (check12ValidFormat(lesson_status, scorm12_regex.CMIStatus)) {
+        this.#lesson_status = lesson_status;
+      }
+    } else {
       if (check12ValidFormat(lesson_status, scorm12_regex.CMIStatus2)) {
         this.#lesson_status = lesson_status;
       }
     }
+  }
 
   /**
    * Getter for #entry

test/cmi/scorm12_cmi.spec.js

@@ -438,15 +438,25 @@ describe('SCORM 1.2 CMI Tests', () => {
         expectedValue: 'not attempted',
       });
       h.checkWrite({
-        cmi: cmiInitialized(),
+        cmi: cmi(),
         fieldName: 'cmi.core.lesson_status',
         valueToTest: 'not attempted',
       });
+      h.checkValidValues({
+        cmi: cmi(),
+        fieldName: 'cmi.core.lesson_status',
+        validValues: scorm12_values.validLessonStatus.concat([
+          'not attempted',
+        ]),
+        invalidValues: scorm12_values.invalidLessonStatus,
+      });
       h.checkValidValues({
         cmi: cmiInitialized(),
         fieldName: 'cmi.core.lesson_status',
         validValues: scorm12_values.validLessonStatus,
-        invalidValues: scorm12_values.invalidLessonStatus,
+        invalidValues: scorm12_values.invalidLessonStatus.concat([
+          'not attempted',
+        ]),
       });
       h.checkReadOnly({
         cmi: cmiInitialized(),