diff --git a/src/trigger.ts b/src/trigger.ts
index 838751f3b5..7ca8cfd4b2 100644
--- a/src/trigger.ts
+++ b/src/trigger.ts
@@ -188,7 +188,17 @@ export class Trigger extends Base {
   }
   protected getUsedVariables(): string[] {
     if(!this.conditionRunner) return [];
-    return this.conditionRunner.getVariables();
+    const res = this.conditionRunner.getVariables();
+    if(Array.isArray(res)) {
+      const unw = "-unwrapped";
+      for(let i = res.length -1; i >= 0; i--) {
+        const s = res[i];
+        if(s.endsWith(unw)) {
+          res.push(s.substring(0, s.length - unw.length));
+        }
+      }
+    }
+    return res;
   }
   private createConditionRunner() {
     if (!!this.conditionRunner) return;
diff --git a/tests/question_baseselecttests.ts b/tests/question_baseselecttests.ts
index 5fb12a494d..da661d9d57 100644
--- a/tests/question_baseselecttests.ts
+++ b/tests/question_baseselecttests.ts
@@ -2119,3 +2119,44 @@ QUnit.test("dropdown.clearValue(true) for showCommentArea & showOtherItem, bug#8
   assert.equal(q4.value, undefined, "q4.value");
   assert.notOk(q4.comment, "q4.comment");
 });
+QUnit.test("valuePropertyName & complete trigger, bug#8434", (assert) => {
+  const survey = new SurveyModel({
+    "pages": [
+      {
+        "name": "page1",
+        "elements": [
+          {
+            "type": "checkbox",
+            "name": "models",
+            "choices": [1, 2, 3],
+            "showNoneItem": true,
+            "valuePropertyName": "model_id"
+          }
+        ]
+      },
+      {
+        "name": "page2",
+        "elements": [
+          {
+            "type": "text",
+            "name": "question1"
+          }
+        ]
+      }
+    ],
+    "triggers": [
+      {
+        "type": "complete",
+        "expression": "{models-unwrapped} = ['none']"
+      }
+    ]
+  });
+  const q = <QuestionCheckboxModel>survey.getQuestionByName("models");
+  assert.equal(survey.calcIsCompleteButtonVisible(), false, "#1");
+  q.renderedValue = ["none"];
+  assert.equal(survey.calcIsCompleteButtonVisible(), true, "#2");
+  q.renderedValue = [1];
+  assert.equal(survey.calcIsCompleteButtonVisible(), false, "#3");
+  q.renderedValue = ["none"];
+  assert.equal(survey.calcIsCompleteButtonVisible(), true, "#4");
+});