diff --git a/src/Symfony/Component/Finder/Finder.php b/src/Symfony/Component/Finder/Finder.php
index 58a520851e2..f1558eeb5df 100644
--- a/src/Symfony/Component/Finder/Finder.php
+++ b/src/Symfony/Component/Finder/Finder.php
@@ -59,7 +59,6 @@ class Finder implements \IteratorAggregate, \Countable
     private int $ignore = 0;
     private array $dirs = [];
     private array $dates = [];
-    /** @var list<\Iterator<string, SplFileInfo>> */
     private array $iterators = [];
     private array $contains = [];
     private array $notContains = [];
@@ -667,27 +666,39 @@ class Finder implements \IteratorAggregate, \Countable
      */
     public function getIterator(): \Iterator
     {
-        if (0 === \count($this->dirs) && 0 === \count($this->iterators)) {
+        if (!$this->dirs && !$this->iterators) {
             throw new \LogicException('You must call one of in() or append() methods before iterating over a Finder.');
         }
 
-        if (1 === \count($this->dirs) && 0 === \count($this->iterators)) {
+        if (1 === \count($this->dirs) && !$this->iterators) {
             $iterator = $this->searchInDirectory($this->dirs[0]);
-
-            if ($this->sort || $this->reverseSorting) {
-                $iterator = (new Iterator\SortableIterator($iterator, $this->sort, $this->reverseSorting))->getIterator();
+        } else {
+            $iterator = new \AppendIterator();
+            foreach ($this->dirs as $dir) {
+                $iterator->append(new \IteratorIterator(new LazyIterator(fn () => $this->searchInDirectory($dir))));
             }
 
-            return $iterator;
-        }
-
-        $iterator = new \AppendIterator();
-        foreach ($this->dirs as $dir) {
-            $iterator->append(new \IteratorIterator(new LazyIterator(fn () => $this->searchInDirectory($dir))));
-        }
-
-        foreach ($this->iterators as $it) {
-            $iterator->append($it);
+            $yielded = [];
+
+            foreach ($this->iterators as $it) {
+                $iterator->append((static function () use ($it, &$yielded) {
+                    foreach ($it as $file) {
+                        if (!$file instanceof \SplFileInfo) {
+                            $file = new \SplFileInfo($file);
+                        }
+                        if (isset($yielded[$key = $file->getPathname()])) {
+                            continue;
+                        }
+                        if (!$file instanceof SplFileInfo) {
+                            $file = new SplFileInfo($key, $file->getPath(), $key);
+                        } else {
+                            $yielded[$key] = true;
+                        }
+
+                        yield $key => $file;
+                    }
+                })());
+            }
         }
 
         if ($this->sort || $this->reverseSorting) {
@@ -708,31 +719,7 @@ class Finder implements \IteratorAggregate, \Countable
      */
     public function append(iterable $iterator): static
     {
-        if ($iterator instanceof self) {
-            $this->iterators[] = $iterator->getIterator();
-        } else {
-            /** @var \ArrayIterator<string, SplFileInfo> $it */
-            $it = new \ArrayIterator();
-            foreach ($iterator as $file) {
-                if ($file instanceof SplFileInfo) {
-                    $it[$file->getPathname()] = $file;
-                } elseif ($file instanceof \SplFileInfo) {
-                    $it[$file->getPathname()] = new SplFileInfo(
-                        $file->getPathname(),
-                        $file->getPath(),
-                        $file->getPathname(),
-                    );
-                } else {
-                    $file = new \SplFileInfo($file);
-                    $it[$file->getPathname()] = new SplFileInfo(
-                        $file->getPathname(),
-                        $file->getPath(),
-                        $file->getPathname(),
-                    );
-                }
-            }
-            $this->iterators[] = $it;
-        }
+        $this->iterators[] = $iterator;
 
         return $this;
     }
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php b/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php
index 943c9ad0b38..dc9414a750d 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/RealIteratorTestCase.php
@@ -72,8 +72,9 @@ abstract class RealIteratorTestCase extends IteratorTestCase
         file_put_contents(self::toAbsolute('test.php'), str_repeat(' ', 800));
         file_put_contents(self::toAbsolute('test.py'), str_repeat(' ', 2000));
 
-        touch(self::toAbsolute('foo/bar.tmp'), strtotime('2005-10-15'));
-        touch(self::toAbsolute('test.php'), strtotime('2005-10-15'));
+        $oneYearAgo = strtotime('-1 year');
+        touch(self::toAbsolute('foo/bar.tmp'), $oneYearAgo);
+        touch(self::toAbsolute('test.php'), $oneYearAgo);
 
         if (FinderTest::class === static::class) {
             $fs = new Filesystem();