diff --git a/lib/Controller/ApiController.php b/lib/Controller/ApiController.php
index 61238a08..681f3bf9 100644
--- a/lib/Controller/ApiController.php
+++ b/lib/Controller/ApiController.php
@@ -961,7 +961,7 @@ class ApiController extends OCSController {
 					$optionIndex = array_search($answer, array_column($question['options'], 'id'));
 					if ($optionIndex !== false) {
 						$answerText = $question['options'][$optionIndex]['text'];
-					} elseif (!empty($question['extraSettings']->allowOtherAnswer) && strpos($answer, Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX) === 0) {
+					} elseif (!empty($question['extraSettings']['allowOtherAnswer']) && strpos($answer, Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX) === 0) {
 						$answerText = str_replace(Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX, "", $answer);
 					}
 				} else {
diff --git a/lib/Service/SubmissionService.php b/lib/Service/SubmissionService.php
index 04bc0875..5fbee91d 100644
--- a/lib/Service/SubmissionService.php
+++ b/lib/Service/SubmissionService.php
@@ -302,7 +302,7 @@ class SubmissionService {
 	 * @return boolean If the submission is valid
 	 */
 	public function validateSubmission(array $questions, array $answers): bool {
-		
+
 		// Check by questions
 		foreach ($questions as $question) {
 			$questionId = $question['id'];
@@ -312,7 +312,7 @@ class SubmissionService {
 			if ($question['isRequired'] &&
 				(!$questionAnswered ||
 				!array_filter($answers[$questionId], 'strlen') ||
-				(!empty($question['extraSettings']->allowOtherAnswer) && !array_filter($answers[$questionId], fn ($value) => $value !== Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX)))
+				(!empty($question['extraSettings']['allowOtherAnswer']) && !array_filter($answers[$questionId], fn ($value) => $value !== Constants::QUESTION_EXTRASETTINGS_OTHER_PREFIX)))
 			) {
 				return false;
 			}
@@ -334,7 +334,7 @@ class SubmissionService {
 				}
 
 				// Check if all answers are within the possible options
-				if (in_array($question['type'], Constants::ANSWER_TYPES_PREDEFINED) && empty($question['extraSettings']->allowOtherAnswer)) {
+				if (in_array($question['type'], Constants::ANSWER_TYPES_PREDEFINED) && empty($question['extraSettings']['allowOtherAnswer'])) {
 					foreach ($answers[$questionId] as $answer) {
 						// Search corresponding option, return false if non-existent
 						if (array_search($answer, array_column($question['options'], 'id')) === false) {
diff --git a/src/components/Questions/QuestionMultiple.vue b/src/components/Questions/QuestionMultiple.vue
index 3ec4a9f1..33d4897b 100644
--- a/src/components/Questions/QuestionMultiple.vue
+++ b/src/components/Questions/QuestionMultiple.vue
@@ -48,7 +48,7 @@
 			<fieldset :name="name || undefined" :aria-labelledby="titleId">
 				<NcCheckboxRadioSwitch v-for="(answer) in sortedOptions"
 					:key="answer.id"
-					:checked.sync="questionValues"
+					:checked="questionValues"
 					:value="answer.id.toString()"
 					:name="`${id}-answer`"
 					:type="isUnique ? 'radio' : 'checkbox'"
@@ -58,7 +58,7 @@
 					{{ answer.text }}
 				</NcCheckboxRadioSwitch>
 				<div v-if="allowOtherAnswer" class="question__other-answer">
-					<NcCheckboxRadioSwitch :checked.sync="questionValues"
+					<NcCheckboxRadioSwitch :checked="questionValues"
 						:value="valueOtherAnswer"
 						:name="`${id}-answer`"
 						:type="isUnique ? 'radio' : 'checkbox'"
@@ -149,20 +149,12 @@ export default {
 
 	data() {
 		return {
-			questionValues: this.values,
 			inputOtherAnswer: this.valueToInputOtherAnswer(),
 			QUESTION_EXTRASETTINGS_OTHER_PREFIX: 'system-other-answer:',
 		}
 	},
 
 	computed: {
-		placeholderOtherAnswer() {
-			if (this.readOnly) {
-				return this.answerType.submitPlaceholder
-			}
-			return this.answerType.createPlaceholder
-		},
-
 		contentValid() {
 			return this.answerType.validate(this)
 		},
@@ -192,6 +184,17 @@ export default {
 			return this.isUnique ? IconRadioboxBlank : IconCheckboxBlankOutline
 		},
 
+		placeholderOtherAnswer() {
+			if (this.readOnly) {
+				return this.answerType.submitPlaceholder
+			}
+			return this.answerType.createPlaceholder
+		},
+
+		questionValues() {
+			return this.isUnique ? this.values?.[0] : this.values
+		},
+
 		titleId() {
 			return `q${this.$attrs.index}_title`
 		},
@@ -205,7 +208,7 @@ export default {
 		},
 
 		hasRequiredOtherAnswerInput() {
-			const checkedOtherAnswer = this.questionValues.filter(item => item.startsWith(this.QUESTION_EXTRASETTINGS_OTHER_PREFIX))
+			const checkedOtherAnswer = this.values.filter(item => item.startsWith(this.QUESTION_EXTRASETTINGS_OTHER_PREFIX))
 			return checkedOtherAnswer[0] !== undefined
 		},
 	},
@@ -229,24 +232,22 @@ export default {
 
 		inputOtherAnswer() {
 			if (this.isUnique) {
-				this.questionValues = this.valueOtherAnswer
-				this.onChange()
+				this.onChange(this.valueOtherAnswer)
 				return
 			}
 
-			this.questionValues = this.questionValues.filter(item => !item.startsWith(this.QUESTION_EXTRASETTINGS_OTHER_PREFIX))
-
+			const values = this.values.filter(item => !item.startsWith(this.QUESTION_EXTRASETTINGS_OTHER_PREFIX))
 			if (this.inputOtherAnswer !== '') {
-				this.questionValues.push(this.valueOtherAnswer)
+				values.push(this.valueOtherAnswer)
 			}
 
-			this.onChange()
+			this.onChange(values)
 		},
 	},
 
 	methods: {
-		onChange() {
-			this.$emit('update:values', this.isUnique ? [this.questionValues] : this.questionValues)
+		onChange(value) {
+			this.$emit('update:values', this.isUnique ? [value] : value)
 		},
 
 		/**
diff --git a/tests/Unit/Controller/ApiControllerTest.php b/tests/Unit/Controller/ApiControllerTest.php
index 0e1bb03c..5c3c6bd6 100644
--- a/tests/Unit/Controller/ApiControllerTest.php
+++ b/tests/Unit/Controller/ApiControllerTest.php
@@ -572,7 +572,7 @@ class ApiControllerTest extends TestCase {
 			[
 				'id' => 2,
 				'type' => Constants::ANSWER_TYPE_MULTIPLE,
-				'extraSettings' => (object)['allowOtherAnswer' => true],
+				'extraSettings' => ['allowOtherAnswer' => true],
 				'options' => [
 					['id' => 1, 'text' => 'test id 1'],
 					['id' => 2, 'text' => 'test id 2'],
diff --git a/tests/Unit/Service/SubmissionServiceTest.php b/tests/Unit/Service/SubmissionServiceTest.php
index d946f64d..ae812d45 100644
--- a/tests/Unit/Service/SubmissionServiceTest.php
+++ b/tests/Unit/Service/SubmissionServiceTest.php
@@ -564,7 +564,7 @@ class SubmissionServiceTest extends TestCase {
 			'required-empty-other-answer' => [
 				// Questions
 				[
-					['id' => 1, 'type' => 'multiple_unique', 'isRequired' => true, 'extraSettings' => (object)['allowOtherAnswer' => true], 'options' => [
+					['id' => 1, 'type' => 'multiple_unique', 'isRequired' => true, 'extraSettings' => ['allowOtherAnswer' => true], 'options' => [
 						['id' => 3]
 					]]
 				],
@@ -664,7 +664,7 @@ class SubmissionServiceTest extends TestCase {
 						['id' => 6]
 					]],
 					['id' => 8, 'type' => 'time', 'isRequired' => false],
-					['id' => 9, 'type' => 'multiple_unique', 'isRequired' => true, 'extraSettings' => (object)['allowOtherAnswer' => true], 'options' => [
+					['id' => 9, 'type' => 'multiple_unique', 'isRequired' => true, 'extraSettings' => ['allowOtherAnswer' => true], 'options' => [
 						['id' => 3]
 					]],
 				],