diff --git a/classes/publication/PKPPublication.php b/classes/publication/PKPPublication.php
index e3cbb6a4596..e796f1f7020 100644
--- a/classes/publication/PKPPublication.php
+++ b/classes/publication/PKPPublication.php
@@ -467,6 +467,7 @@ public function getLanguages(array $additionalLocales = []): array
             ->concat($additionalLocales)
             ->flatten()
             ->unique()
+            ->values()
             ->toArray();
     }
 }
diff --git a/classes/submissionFile/maps/Schema.php b/classes/submissionFile/maps/Schema.php
index 8e86ac5a514..37e0fbce086 100644
--- a/classes/submissionFile/maps/Schema.php
+++ b/classes/submissionFile/maps/Schema.php
@@ -226,9 +226,16 @@ protected function mapByProperties(array $props, SubmissionFile $submissionFile)
             $output[$prop] = $submissionFile->getData($prop);
         }
 
-        $publicationId = $submissionFile->getData('assocId') ? Repo::galley()->get($submissionFile->getData('assocId'))?->getData('publicationId') : null;
-        $publicationLocales = $publicationId ? Repo::publication()->get($publicationId)?->getLanguages() ?? [] : [];
-        $locales = array_values(array_unique(array_merge($this->context->getSupportedSubmissionMetadataLocales(), $publicationLocales, [$submissionFile->getData('locale')])));
+        $publicationLocales = !($assocId = $submissionFile->getData('assocId')) 
+        ? [$submissionFile->getData('locale')]
+        : Repo::submission()
+            ->get($submissionFile->getData('submissionId'))
+            ->getData('publications')
+            ->first(fn ($p) => collect($p->getData(Application::get()->getName() === 'omp' ? 'publicationFormats' : 'galleys'))
+                ->contains(fn ($item) => $item->getId() === $assocId))
+            ->getLanguages();
+
+        $locales = array_values(array_unique(array_merge($this->context->getSupportedSubmissionMetadataLocales(), $publicationLocales)));
 
         $output = $this->schemaService->addMissingMultilingualValues(
             $this->schema,
diff --git a/controllers/wizard/fileUpload/form/SubmissionFilesMetadataForm.php b/controllers/wizard/fileUpload/form/SubmissionFilesMetadataForm.php
index 71a2c370338..868492f9680 100644
--- a/controllers/wizard/fileUpload/form/SubmissionFilesMetadataForm.php
+++ b/controllers/wizard/fileUpload/form/SubmissionFilesMetadataForm.php
@@ -51,7 +51,12 @@ public function __construct($submissionFile, $stageId, $reviewRound = null, $tem
         }
 
         $submissionLocale = $submissionFile->getData('locale');
-        $publicationLocaleNames = Repo::publication()->get(Repo::galley()->get($submissionFile->getData('assocId'))?->getData('publicationId'))?->getLanguageNames() ?? [];
+        $publicationLocaleNames = Repo::submission()
+            ->get($submissionFile->getData('submissionId'))
+            ->getData('publications')
+            ->first(fn ($p) => collect($p->getData(Application::get()->getName() === 'omp' ? 'publicationFormats' : 'galleys'))
+                ->contains(fn ($item) => $item->getId() === $submissionFile->getData('assocId')))
+            ->getLanguageNames();
         $localeNames = Application::get()->getRequest()->getContext()->getSupportedSubmissionMetadataLocaleNames() + $publicationLocaleNames;
         ksort($localeNames);
 
diff --git a/pages/authorDashboard/PKPAuthorDashboardHandler.php b/pages/authorDashboard/PKPAuthorDashboardHandler.php
index 0cbef1726b6..f0cd6fd0110 100644
--- a/pages/authorDashboard/PKPAuthorDashboardHandler.php
+++ b/pages/authorDashboard/PKPAuthorDashboardHandler.php
@@ -221,6 +221,7 @@ public function setupTemplate($request)
         $locales = collect($submissionContext->getSupportedSubmissionMetadataLocaleNames() + $latestPublication->getLanguageNames())
             ->map(fn (string $name, string $locale) => ['key' => $locale, 'label' => $name])
             ->sortBy('key')
+            ->values()
             ->toArray();
 
         $submissionApiUrl = $request->getDispatcher()->url($request, PKPApplication::ROUTE_API, $submissionContext->getData('urlPath'), 'submissions/' . $submission->getId());
@@ -392,8 +393,8 @@ protected function getLocalizedForm(\PKP\components\forms\FormComponent $form, P
 
         $config['supportedFormLocales'] = collect($context->getSupportedSubmissionMetadataLocaleNames() + $publication->getLanguageNames())
             ->map(fn (string $name, string $locale) => ['key' => $locale, 'label' => $name])
-            ->values()
             ->sortBy([fn (array $a, array $b) => $a['key'] === $primaryLocale || $a['key'] < $b['key'] ? -1 : 1])
+            ->values()
             ->toArray();
 
         return $config;
diff --git a/pages/workflow/PKPWorkflowHandler.php b/pages/workflow/PKPWorkflowHandler.php
index daa589e5716..8841f953560 100644
--- a/pages/workflow/PKPWorkflowHandler.php
+++ b/pages/workflow/PKPWorkflowHandler.php
@@ -221,6 +221,7 @@ public function index($args, $request)
         $locales = collect($submissionContext->getSupportedSubmissionMetadataLocaleNames() + $latestPublication->getLanguageNames())
             ->map(fn (string $name, string $locale) => ['key' => $locale, 'label' => $name])
             ->sortBy('key')
+            ->values()
             ->toArray();
 
         $submissionApiUrl = $request->getDispatcher()->url($request, Application::ROUTE_API, $submissionContext->getData('urlPath'), 'submissions/' . $submission->getId());
@@ -844,8 +845,8 @@ protected function getLocalizedForm(\PKP\components\forms\FormComponent $form, P
 
         $config['supportedFormLocales'] = collect($context->getSupportedSubmissionMetadataLocaleNames() + $publication->getLanguageNames())
             ->map(fn (string $name, string $locale) => ['key' => $locale, 'label' => $name])
-            ->values()
             ->sortBy([fn (array $a, array $b) => $a['key'] === $primaryLocale || $a['key'] < $b['key'] ? -1 : 1])
+            ->values()
             ->toArray();
 
         return $config;