diff --git a/apps/comments/lib/Activity/Listener.php b/apps/comments/lib/Activity/Listener.php
index 5e79b5fda7348..939f17dcd2e66 100644
--- a/apps/comments/lib/Activity/Listener.php
+++ b/apps/comments/lib/Activity/Listener.php
@@ -37,10 +37,9 @@ public function commentEvent(CommentsEvent $event): void {
 
 		$cache = $this->mountCollection->getMountCache();
 
-		$users = [];
-		$filesPerUser = $cache->getReadableNodesByUserForFileId((int)$event->getComment()->getObjectId());
-		foreach ($filesPerUser as $user => $files) {
-			$users[$user] = $this->rootFolder->getUserFolder($user)->getRelativePath(reset($files)?->getPath() ?? '');
+		$users = $cache->getReadablePathByUserForFileId((int)$event->getComment()->getObjectId());
+		if (empty($users)) {
+			return;
 		}
 
 		$actor = $this->session->getUser();
diff --git a/apps/systemtags/lib/Activity/Listener.php b/apps/systemtags/lib/Activity/Listener.php
index cfd5fefb08ded..1fdad6f42c9ff 100644
--- a/apps/systemtags/lib/Activity/Listener.php
+++ b/apps/systemtags/lib/Activity/Listener.php
@@ -153,14 +153,10 @@ public function mapperEvent(MapperEvent $event) {
 		// Get all mount point owners
 		$cache = $this->mountCollection->getMountCache();
 
-		$users = [];
-		$filesPerUser = $cache->getReadableNodesByUserForFileId((int)$event->getObjectId());
-		if (empty($filesPerUser)) {
+		$users = $cache->getReadablePathByUserForFileId((int)$event->getObjectId());
+		if (empty($users)) {
 			return;
 		}
-		foreach ($filesPerUser as $user => $files) {
-			$users[$user] = $this->rootFolder->getUserFolder($user)->getRelativePath(reset($files)?->getPath() ?? '');
-		}
 
 		$actor = $this->session->getUser();
 		if ($actor instanceof IUser) {
diff --git a/lib/private/Files/Config/UserMountCache.php b/lib/private/Files/Config/UserMountCache.php
index 0d72e3a6d4f89..2445f54c56ad1 100644
--- a/lib/private/Files/Config/UserMountCache.php
+++ b/lib/private/Files/Config/UserMountCache.php
@@ -395,12 +395,45 @@ public function getReadableNodesByUserForFileId(int $fileId): array {
 		$rootFolder = Server::get(IRootFolder::class);
 		$result = [];
 		foreach ($mounts as $mount) {
-			if (isset($result[$mount->getUser()->getUID()])) {
+			$uid = $mount->getUser()->getUID();
+			if (!isset($result[$uid])) {
+				$result[$uid] = [];
+			}
+
+			$userFolder = $rootFolder->getUserFolder($uid);
+			$result[$uid] = array_merge($result[$uid], $userFolder->getById($fileId));
+		}
+
+		return array_filter($result);
+	}
+
+	/**
+	 * Get all users having read access to a file, with a path they see it as.
+	 * They may see the same file under other paths,
+	 *  to get this information use the exhaustive getReadableNodesByUserForFileId
+	 *
+	 * @return array<string,string> Paths giving access to the given fileId, indexed by user ID
+	 * @since 28.0.0
+	 */
+	public function getReadablePathByUserForFileId(int $fileId): array {
+		$mounts = $this->getMountsForFileId($fileId);
+		$rootFolder = Server::get(IRootFolder::class);
+		$result = [];
+		foreach ($mounts as $mount) {
+			$uid = $mount->getUser()->getUID();
+			if (isset($result[$uid])) {
 				continue;
 			}
 
-			$userFolder = $rootFolder->getUserFolder($mount->getUser()->getUID());
-			$result[$mount->getUser()->getUID()] = $userFolder->getById($fileId);
+			$userFolder = $rootFolder->getUserFolder($uid);
+			$nodes = $userFolder->getById($fileId);
+			$node = reset($nodes);
+			if ($node) {
+				$path = $userFolder->getRelativePath($node->getPath());
+				if ($path !== null) {
+					$result[$uid] = $path;
+				}
+			}
 		}
 
 		return $result;
diff --git a/lib/public/Files/Config/IUserMountCache.php b/lib/public/Files/Config/IUserMountCache.php
index 2ec368f80ad1d..5c4fcf83f4ae9 100644
--- a/lib/public/Files/Config/IUserMountCache.php
+++ b/lib/public/Files/Config/IUserMountCache.php
@@ -74,6 +74,15 @@ public function getMountsForFileId($fileId, $user = null);
 	 */
 	public function getReadableNodesByUserForFileId(int $fileId): array;
 
+	/**
+	 * Get all users having read access to a file, with a path they see it as.
+	 * They may see the same file under other paths, to get this information use exhaustive getReadableNodesByUserForFileId
+	 *
+	 * @return array<string, string> Paths giving access to the given fileId, indexed by user ID
+	 * @since 28.0.0
+	 */
+	public function getReadablePathByUserForFileId(int $fileId): array;
+
 	/**
 	 * Remove all cached mounts for a user
 	 *