diff --git a/apps/dav/appinfo/info.xml b/apps/dav/appinfo/info.xml
index 9021ba98a0fc8..baf1021d3e60c 100644
--- a/apps/dav/appinfo/info.xml
+++ b/apps/dav/appinfo/info.xml
@@ -10,7 +10,7 @@
 	<name>WebDAV</name>
 	<summary>WebDAV endpoint</summary>
 	<description>WebDAV endpoint</description>
-	<version>1.34.0</version>
+	<version>1.34.1</version>
 	<licence>agpl</licence>
 	<author>owncloud.org</author>
 	<namespace>DAV</namespace>
diff --git a/apps/dav/composer/composer/autoload_classmap.php b/apps/dav/composer/composer/autoload_classmap.php
index 764f94ef66546..a2ca8e501e435 100644
--- a/apps/dav/composer/composer/autoload_classmap.php
+++ b/apps/dav/composer/composer/autoload_classmap.php
@@ -353,6 +353,7 @@
     'OCA\\DAV\\Migration\\Version1029Date20231004091403' => $baseDir . '/../lib/Migration/Version1029Date20231004091403.php',
     'OCA\\DAV\\Migration\\Version1030Date20240205103243' => $baseDir . '/../lib/Migration/Version1030Date20240205103243.php',
     'OCA\\DAV\\Migration\\Version1031Date20240610134258' => $baseDir . '/../lib/Migration/Version1031Date20240610134258.php',
+    'OCA\\DAV\\Migration\\Version1034Date20250813093701' => $baseDir . '/../lib/Migration/Version1034Date20250813093701.php',
     'OCA\\DAV\\Model\\ExampleEvent' => $baseDir . '/../lib/Model/ExampleEvent.php',
     'OCA\\DAV\\Paginate\\LimitedCopyIterator' => $baseDir . '/../lib/Paginate/LimitedCopyIterator.php',
     'OCA\\DAV\\Paginate\\PaginateCache' => $baseDir . '/../lib/Paginate/PaginateCache.php',
diff --git a/apps/dav/composer/composer/autoload_static.php b/apps/dav/composer/composer/autoload_static.php
index f3d1eacfcd0b2..0bad18100597b 100644
--- a/apps/dav/composer/composer/autoload_static.php
+++ b/apps/dav/composer/composer/autoload_static.php
@@ -368,6 +368,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Migration\\Version1029Date20231004091403' => __DIR__ . '/..' . '/../lib/Migration/Version1029Date20231004091403.php',
         'OCA\\DAV\\Migration\\Version1030Date20240205103243' => __DIR__ . '/..' . '/../lib/Migration/Version1030Date20240205103243.php',
         'OCA\\DAV\\Migration\\Version1031Date20240610134258' => __DIR__ . '/..' . '/../lib/Migration/Version1031Date20240610134258.php',
+        'OCA\\DAV\\Migration\\Version1034Date20250813093701' => __DIR__ . '/..' . '/../lib/Migration/Version1034Date20250813093701.php',
         'OCA\\DAV\\Model\\ExampleEvent' => __DIR__ . '/..' . '/../lib/Model/ExampleEvent.php',
         'OCA\\DAV\\Paginate\\LimitedCopyIterator' => __DIR__ . '/..' . '/../lib/Paginate/LimitedCopyIterator.php',
         'OCA\\DAV\\Paginate\\PaginateCache' => __DIR__ . '/..' . '/../lib/Paginate/PaginateCache.php',
diff --git a/apps/dav/lib/DAV/CustomPropertiesBackend.php b/apps/dav/lib/DAV/CustomPropertiesBackend.php
index f3fff11b3da73..1c231a135a144 100644
--- a/apps/dav/lib/DAV/CustomPropertiesBackend.php
+++ b/apps/dav/lib/DAV/CustomPropertiesBackend.php
@@ -118,6 +118,13 @@ class CustomPropertiesBackend implements BackendInterface {
 		'{urn:ietf:params:xml:ns:caldav}schedule-default-calendar-URL' => Href::class,
 	];
 
+	/**
+	 * Map of well-known property names to default values
+	 */
+	private const PROPERTY_DEFAULT_VALUES = [
+		'{http://owncloud.org/ns}calendar-enabled' => '1',
+	];
+
 	/**
 	 * Properties cache
 	 *
@@ -422,6 +429,14 @@ private function getUserProperties(string $path, array $requestedProperties) {
 		return $props;
 	}
 
+	private function isPropertyDefaultValue(string $name, mixed $value): bool {
+		if (!isset(self::PROPERTY_DEFAULT_VALUES[$name])) {
+			return false;
+		}
+
+		return self::PROPERTY_DEFAULT_VALUES[$name] === $value;
+	}
+
 	/**
 	 * @throws Exception
 	 */
@@ -438,8 +453,8 @@ private function updateProperties(string $path, array $properties): bool {
 					'propertyName' => $propertyName,
 				];
 
-				// If it was null, we need to delete the property
-				if (is_null($propertyValue)) {
+				// If it was null or set to the default value, we need to delete the property
+				if (is_null($propertyValue) || $this->isPropertyDefaultValue($propertyName, $propertyValue)) {
 					if (array_key_exists($propertyName, $existing)) {
 						$deleteQuery = $deleteQuery ?? $this->createDeleteQuery();
 						$deleteQuery
diff --git a/apps/dav/lib/Migration/Version1034Date20250813093701.php b/apps/dav/lib/Migration/Version1034Date20250813093701.php
new file mode 100644
index 0000000000000..10be71f067bef
--- /dev/null
+++ b/apps/dav/lib/Migration/Version1034Date20250813093701.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\IDBConnection;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+use Override;
+
+class Version1034Date20250813093701 extends SimpleMigrationStep {
+	public function __construct(
+		private IDBConnection $db,
+	) {
+	}
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure(): ISchemaWrapper $schemaClosure
+	 * @param array $options
+	 */
+	#[Override]
+	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
+		$qb = $this->db->getQueryBuilder();
+		$qb->delete('properties')
+			->where($qb->expr()->eq(
+				'propertyname',
+				$qb->createNamedParameter(
+					'{http://owncloud.org/ns}calendar-enabled',
+					IQueryBuilder::PARAM_STR,
+				),
+				IQueryBuilder::PARAM_STR,
+			))
+			->andWhere($qb->expr()->eq(
+				'propertyvalue',
+				$qb->createNamedParameter(
+					'1',
+					IQueryBuilder::PARAM_STR,
+				),
+				IQueryBuilder::PARAM_STR,
+			))
+			->executeStatement();
+	}
+}