fix: sanitize dots in path collection config (#3518)

packages/netlify-cms-core/src/lib/__tests__/formatters.spec.js

@@ -281,6 +281,21 @@ describe('formatters', () => {
         ),
       ).toBe('sub_dir/2020/2020-01-01-post-title.en');
     });
+
+    it(`should replace '.' in path with -`, () => {
+      selectIdentifier.mockReturnValueOnce('title');
+
+      expect(
+        slugFormatter(
+          Map({
+            slug: '{{slug}}.en',
+            path: '../dir/{{slug}}',
+          }),
+          Map({ title: 'Post Title' }),
+          slugConfig,
+        ),
+      ).toBe('--/dir/post-title.en');
+    });
   });
 
   describe('previewUrlFormatter', () => {

packages/netlify-cms-core/src/lib/formatters.ts

@@ -115,7 +115,7 @@ export const slugFormatter = (
   if (!collection.has('path')) {
     return slug;
   } else {
-    const pathTemplate = collection.get('path') as string;
+    const pathTemplate = prepareSlug(collection.get('path') as string);
     return compileStringTemplate(pathTemplate, date, slug, entryData, (value: string) =>
       value === slug ? value : processSegment(value),
     );