TYPO3 Core

Better Hotfix, also work on second `composer install` run on Windows:

File vendor\typo3\cms-core\Classes\Composer\PackageArtifactBuilder.php:

private function publishResources(array $installedTypo3Packages): void
    {
        $fileSystem = new Filesystem();
        $baseDir = $this->config->get('base-dir');
        foreach ($installedTypo3Packages as [$composerPackage, $path, $extensionKey]) {
            $fileSystemResourcesPath = $path . '/Resources/Public';
            if (str_contains($path, 'ext/' . $extensionKey) || !file_exists($fileSystemResourcesPath)) {
                continue;
            }
            $relativePath = substr($fileSystemResourcesPath, strlen($baseDir));
            [$relativePrefix] = explode('Resources/Public', $relativePath);
            if (\Composer\Util\Platform::isWindows()) {
                $relativePrefix = str_replace('\\', '/', $relativePrefix);
            }
            $publicResourcesPath = $fileSystem->normalizePath($this->config->get('web-dir') . '/_assets/' . md5($relativePrefix));
            $fileSystem->ensureDirectoryExists(dirname($publicResourcesPath));
            if (\Composer\Util\Platform::isWindows()) {
                if (!$fileSystem->isJunction($publicResourcesPath)) {
                    $fileSystem->junction($fileSystemResourcesPath, $publicResourcesPath);
                }
            } else {
                if (!$fileSystem->isSymlinkedDirectory($publicResourcesPath)) {
                   $fileSystem->relativeSymlink($fileSystemResourcesPath, $publicResourcesPath);
                }
            }
        }
    }

Well, I think this patch is really a "should have", but I had 2 problems with it:
1. Platform is not defined. An
use xxx/yyy/Platform
is missing here.
2. $relativePrefix has not a correct value. At my windows installation, $relativePrefix is like "\vendor/typo3/cms-backend/".
The correct string should be: "/vendor/typo3/cms-backend/"
So I needed to add this code:

$relativePrefix = str_replace('\\', '/', $relativePrefix);

After that the patch worked correct and created the files in _assets.

Kurt Gusbeth wrote in #note-3:

Well, I think this patch is really a "should have", but I had 2 problems with it:
1. Platform is not defined. An
use xxx/yyy/Platform
is missing here.
2. $relativePrefix has not a correct value. At my windows installation, $relativePrefix is like "\vendor/typo3/cms-backend/".
The correct string should be: "/vendor/typo3/cms-backend/"
So I needed to add this code:
[...]
After that the patch worked correct and created the files in _assets.

Correct. I updated my hotfix code. Thank you.

Problem is fixed TYPO3 12.4.6 => https://forge.typo3.org/issues/98434

This issue can also be closed.