Fix a bug where Craft would attempt to index transforms.

CHANGELOG-v3.md

@@ -19,6 +19,7 @@
 - Fixed a bug where after impersonating another user, the Login page would show the impersonated user’s username rather than the admin’s.
 - Fixed a bug where `craft\services\Sections::getAllSections()` could return stale results if a new section had been added recently. ([#3484](https://github.com/craftcms/cms/issues/3484))
 - Fixed a bug where “View entry” and “View category” element actions weren’t available when viewing a specific section or category group.
+- Fix a bug where Craft would attempt to index transforms.
 
 ### Security
 - Updated jQuery File Upload to 9.28.0.

src/services/AssetIndexer.php

@@ -131,8 +131,13 @@ function($value) {
                 $path = $value['path'];
                 $segments = explode('/', $path);
 
-                foreach ($segments as $segment) {
-                    if (isset($segment[0]) && $segment[0] === '_' && $value['type'] === 'dir') {
+                $segmentCount = count($segments);
+
+                for ($segmentIndex = 0; $segmentIndex < $segmentCount; $segmentIndex++) {
+                    $currentSegment = $segments[$segmentIndex];
+
+                    // Skip if segment begins with an underscrore and (this is a directory or not the last segment)
+                    if ($currentSegment[0] === '_' && ($value['type'] === 'dir' || $segmentIndex + 1 < $segmentCount)) {
                         return false;
                     }
                 }