diff --git a/mailpoet/assets/js/src/email-editor/engine/store/selectors.ts b/mailpoet/assets/js/src/email-editor/engine/store/selectors.ts
index 1d49e7378d..77f96c9a0b 100644
--- a/mailpoet/assets/js/src/email-editor/engine/store/selectors.ts
+++ b/mailpoet/assets/js/src/email-editor/engine/store/selectors.ts
@@ -196,10 +196,18 @@ export const getCurrentTemplate = createRegistrySelector((select) => () => {
  */
 export const getEmailTemplates = createRegistrySelector(
   (select) => () =>
-    select(coreDataStore).getEntityRecords('postType', 'wp_template', {
-      per_page: -1,
-      post_type: 'mailpoet_email',
-    }),
+    select(coreDataStore)
+      .getEntityRecords('postType', 'wp_template', {
+        per_page: -1,
+        post_type: 'mailpoet_email',
+      })
+      // We still need to filter the templates because, in some cases, the API also returns custom templates
+      // ignoring the post_type filter in the query
+      ?.filter(
+        (template) =>
+          // @ts-expect-error Missing property in type
+          template.theme === 'mailpoet/mailpoet',
+      ),
 );
 
 export function getEmailPostId(state: State): number {