Verify whether local transforms exist, regardless of what the index says

#13052 (comment)

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- The image transformer now verifies that transforms don’t exist if the index record is missing, before queuing up the transform generation, for local filesystems. ([#13052](https://github.com/craftcms/cms/issues/13052))
 - `craft\elements\Asset::EVENT_BEFORE_DEFINE_URL` now sends a `craft\events\DefineAssetUrlEvent` object, rather than `craft\events\DefineUrlEvent`. ([#13018](https://github.com/craftcms/cms/issues/13018))
 - `craft\web\View::renderObjectTemplate()` now trims the returned template output.
 - Fixed a bug where users were “View other users’ drafts” section permissions weren’t being enforced for unpublished drafts.

src/imagetransforms/ImageTransformer.php

@@ -86,9 +86,10 @@ public function getTransformUrl(Asset $asset, ImageTransform $imageTransform, bo
         $index = $this->getTransformIndex($asset, $imageTransform);
         $uri = str_replace('\\', '/', $this->getTransformBasePath($asset)) . $this->getTransformUri($asset, $index);
 
-        // If it's a local filesystem, double-check that the transform exists
-        if ($fs instanceof LocalFsInterface && $index->fileExists && !$fs->fileExists($uri)) {
-            $index->fileExists = false;
+        // If it's a local filesystem, make sure `fileExists` is accurate
+        if ($fs instanceof LocalFsInterface && $index->fileExists !== $fs->fileExists($uri)) {
+            // Flip it and save it
+            $index->fileExists = !$index->fileExists;
             $this->storeTransformIndexData($index);
         }