diff --git a/lib/private/Share20/DefaultShareProvider.php b/lib/private/Share20/DefaultShareProvider.php
index 03202f215b248..634d3af44029d 100644
--- a/lib/private/Share20/DefaultShareProvider.php
+++ b/lib/private/Share20/DefaultShareProvider.php
@@ -11,6 +11,7 @@
 use OC\Share20\Exception\BackendError;
 use OC\Share20\Exception\InvalidShare;
 use OC\Share20\Exception\ProviderException;
+use OC\User\LazyUser;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\Defaults;
@@ -909,8 +910,8 @@ public function getSharedWith($userId, $shareType, $node, $limit, $offset) {
 			}
 			$cursor->closeCursor();
 		} elseif ($shareType === IShare::TYPE_GROUP) {
-			$user = $this->userManager->get($userId);
-			$allGroups = ($user instanceof IUser) ? $this->groupManager->getUserGroupIds($user) : [];
+			$user = new LazyUser($userId, $this->userManager);
+			$allGroups = $this->groupManager->getUserGroupIds($user);
 
 			/** @var Share[] $shares2 */
 			$shares2 = [];
@@ -1045,9 +1046,9 @@ private function createShare($data) {
 
 		if ($share->getShareType() === IShare::TYPE_USER) {
 			$share->setSharedWith($data['share_with']);
-			$user = $this->userManager->get($data['share_with']);
-			if ($user !== null) {
-				$share->setSharedWithDisplayName($user->getDisplayName());
+			$displayName = $this->userManager->getDisplayName($data['share_with']);
+			if ($displayName !== null) {
+				$share->setSharedWithDisplayName($displayName);
 			}
 		} elseif ($share->getShareType() === IShare::TYPE_GROUP) {
 			$share->setSharedWith($data['share_with']);
diff --git a/tests/lib/Share20/DefaultShareProviderTest.php b/tests/lib/Share20/DefaultShareProviderTest.php
index 72ef83331e950..e138f2f576bb2 100644
--- a/tests/lib/Share20/DefaultShareProviderTest.php
+++ b/tests/lib/Share20/DefaultShareProviderTest.php
@@ -38,31 +38,31 @@ class DefaultShareProviderTest extends \Test\TestCase {
 	/** @var IDBConnection */
 	protected $dbConn;
 
-	/** @var IUserManager | \PHPUnit\Framework\MockObject\MockObject */
+	/** @var IUserManager | MockObject */
 	protected $userManager;
 
-	/** @var IGroupManager | \PHPUnit\Framework\MockObject\MockObject */
+	/** @var IGroupManager | MockObject */
 	protected $groupManager;
 
-	/** @var IRootFolder | \PHPUnit\Framework\MockObject\MockObject */
+	/** @var IRootFolder | MockObject */
 	protected $rootFolder;
 
 	/** @var DefaultShareProvider */
 	protected $provider;
 
-	/** @var \PHPUnit\Framework\MockObject\MockObject|IMailer */
+	/** @var MockObject|IMailer */
 	protected $mailer;
 
 	/** @var IFactory|MockObject */
 	protected $l10nFactory;
 
-	/** @var \PHPUnit\Framework\MockObject\MockObject|IL10N */
+	/** @var MockObject|IL10N */
 	protected $l10n;
 
-	/** @var \PHPUnit\Framework\MockObject\MockObject|Defaults */
+	/** @var MockObject|Defaults */
 	protected $defaults;
 
-	/** @var \PHPUnit\Framework\MockObject\MockObject|IURLGenerator */
+	/** @var MockObject|IURLGenerator */
 	protected $urlGenerator;
 
 	/** @var ITimeFactory|MockObject */
@@ -1035,7 +1035,9 @@ public function testGetSharedWithGroup($storageStringId, $fileName1, $fileName2)
 			['shareOwner', $owner],
 			['sharedBy', $initiator],
 		]);
-		$this->groupManager->method('getUserGroupIds')->with($user)->willReturn($groups);
+		$this->groupManager
+			->method('getUserGroupIds')
+			->willReturnCallback(fn (IUser $user) => ($user->getUID() === 'sharedWith' ? $groups : []));
 
 		$file = $this->createMock(File::class);
 		$this->rootFolder->method('getUserFolder')->with('shareOwner')->willReturnSelf();
@@ -1123,7 +1125,9 @@ public function testGetSharedWithGroupUserModified($storageStringId, $fileName1,
 			['shareOwner', $owner],
 			['sharedBy', $initiator],
 		]);
-		$this->groupManager->method('getUserGroupIds')->with($user)->willReturn($groups);
+		$this->groupManager
+			->method('getUserGroupIds')
+			->willReturnCallback(fn (IUser $user) => ($user->getUID() === 'user' ? $groups : []));
 
 		$file = $this->createMock(File::class);
 		$this->rootFolder->method('getUserFolder')->with('shareOwner')->willReturnSelf();
@@ -1206,7 +1210,9 @@ public function testGetSharedWithGroupWithNode($storageStringId, $fileName1, $fi
 			['user1', $user1],
 		]);
 
-		$this->groupManager->method('getUserGroupIds')->with($user0)->willReturn(['group0']);
+		$this->groupManager
+			->method('getUserGroupIds')
+			->willReturnCallback(fn (IUser $user) => ($user->getUID() === 'user0' ? ['group0'] : []));
 
 		$node = $this->createMock(Folder::class);
 		$node->method('getId')->willReturn($fileId2);
@@ -1283,7 +1289,9 @@ public function testGetSharedWithWithDeletedFile($shareType, $trashed) {
 			['shareOwner', $owner],
 			['sharedBy', $initiator],
 		]);
-		$this->groupManager->method('getUserGroupIds')->with($user)->willReturn($groups);
+		$this->groupManager
+			->method('getUserGroupIds')
+			->willReturnCallback(fn (IUser $user) => ($user->getUID() === 'sharedWith' ? $groups : []));
 
 		$share = $this->provider->getSharedWith('sharedWith', $shareType, null, 1, 0);
 		$this->assertCount(0, $share);