diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index dbb2e9190..4dd055f9f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -47,5 +47,5 @@ jobs:
             -   name: Run tests
                 run: |
                     ok=0
-                    ./phpunit || ok=1
+                    ./phpunit --filter=IconvTest::testIconvStrlen || ok=1
                     [[ "${{ matrix.mode }}" = experimental ]] || (exit $ok)
diff --git a/src/Iconv/Iconv.php b/src/Iconv/Iconv.php
index c17a70dc2..5cb828250 100644
--- a/src/Iconv/Iconv.php
+++ b/src/Iconv/Iconv.php
@@ -430,20 +430,24 @@ public static function iconv_mime_encode($fieldName, $fieldValue, $pref = null)
 
     public static function iconv_strlen($s, $encoding = null)
     {
+        var_dump(__METHOD__);
         static $hasXml = null;
         if (null === $hasXml) {
             $hasXml = \extension_loaded('xml');
         }
 
-        if ($hasXml) {
+        if ($hasXml && \PHP_VERSION_ID < 80200) {
+            var_dump(__LINE__);
             return self::strlen1($s, $encoding);
         }
+        var_dump(__LINE__);
 
         return self::strlen2($s, $encoding);
     }
 
     public static function strlen1($s, $encoding = null)
     {
+        var_dump(__METHOD__);
         if (null === $encoding) {
             $encoding = self::$internalEncoding;
         }
@@ -451,6 +455,8 @@ public static function strlen1($s, $encoding = null)
             return false;
         }
 
+        debug_print_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+
         return \strlen(utf8_decode($s));
     }
 
diff --git a/src/Iconv/bootstrap.php b/src/Iconv/bootstrap.php
index c11df3b32..1a5a9d91a 100644
--- a/src/Iconv/bootstrap.php
+++ b/src/Iconv/bootstrap.php
@@ -66,7 +66,7 @@ function iconv_mime_decode($string, $mode = 0, $encoding = null) { $currentMbEnc
     }
 } else {
     if (!function_exists('iconv_strlen')) {
-        if (extension_loaded('xml')) {
+        if (extension_loaded('xml') && \PHP_VERSION_ID < 80200) {
             function iconv_strlen($string, $encoding = null) { return p\Iconv::strlen1($string, $encoding); }
         } else {
             function iconv_strlen($string, $encoding = null) { return p\Iconv::strlen2($string, $encoding); }
diff --git a/src/Iconv/bootstrap80.php b/src/Iconv/bootstrap80.php
index 04b1473b7..1ad40417c 100644
--- a/src/Iconv/bootstrap80.php
+++ b/src/Iconv/bootstrap80.php
@@ -11,6 +11,8 @@
 
 use Symfony\Polyfill\Iconv as p;
 
+var_dump(__FILE__);
+
 if (!defined('ICONV_IMPL')) {
     define('ICONV_IMPL', 'Symfony');
 }
@@ -41,6 +43,7 @@ function iconv_mime_decode_headers(?string $headers, ?int $mode = 0, ?string $en
 }
 
 if (extension_loaded('mbstring')) {
+    var_dump(__LINE__);
     if (!function_exists('iconv_strlen')) {
         function iconv_strlen(?string $string, ?string $encoding = null): int|false { null === $encoding && $encoding = p\Iconv::$internalEncoding; return mb_strlen((string) $string, $encoding); }
     }
@@ -58,9 +61,12 @@ function iconv_mime_decode($string, $mode = 0, $encoding = null) { $currentMbEnc
     }
 } else {
     if (!function_exists('iconv_strlen')) {
-        if (extension_loaded('xml')) {
+        var_dump(__LINE__);
+        if (extension_loaded('xml') && \PHP_VERSION_ID < 80200) {
+            var_dump(__LINE__);
             function iconv_strlen(?string $string, ?string $encoding = null): int|false { return p\Iconv::strlen1((string) $string, $encoding); }
         } else {
+            var_dump(__LINE__);
             function iconv_strlen(?string $string, ?string $encoding = null): int|false { return p\Iconv::strlen2((string) $string, $encoding); }
         }
     }
diff --git a/src/Util/TestListenerTrait.php b/src/Util/TestListenerTrait.php
index 58024695c..367be247b 100644
--- a/src/Util/TestListenerTrait.php
+++ b/src/Util/TestListenerTrait.php
@@ -97,6 +97,11 @@ public function startTestSuite($mainSuite)
                     $defLine = sprintf("throw new \\%s('Internal function not found: %s')", SkippedTestError::class, $f['name']);
                 }
 
+                if ($f['name'] === 'iconv_strlen') {
+                    print_r($f);
+                    print_r($r);
+                }
+
                 eval(<<<EOPHP
 namespace {$testNamespace};
 
diff --git a/tests/Iconv/IconvTest.php b/tests/Iconv/IconvTest.php
index 214ea36ef..2a2decdf0 100644
--- a/tests/Iconv/IconvTest.php
+++ b/tests/Iconv/IconvTest.php
@@ -29,7 +29,7 @@ public function testIconv()
         $this->assertFalse(@iconv('UTF-8', 'ISO-8859-1', 'nœud'));
         $this->assertSame('nud', iconv('UTF-8', 'ISO-8859-1//IGNORE', 'nœud'));
 
-        $this->assertSame(utf8_decode('déjà'), iconv('CP1252', 'ISO-8859-1', utf8_decode('déjà')));
+        $this->assertSame(mb_convert_encoding('déjà', 'ISO-8859-1', 'UTF-8'), iconv('CP1252', 'ISO-8859-1', mb_convert_encoding('déjà', 'ISO-8859-1', 'UTF-8')));
         $this->assertSame('deja noeud', p::iconv('UTF-8//ignore//IGNORE', 'US-ASCII//TRANSLIT//IGNORE//translit', 'déjà nœud'));
 
         $this->assertSame('4', iconv('UTF-8', 'UTF-8', 4));
@@ -44,7 +44,7 @@ public function testIconv()
     public function testIconvStrlen()
     {
         $this->assertSame(4, iconv_strlen('déjà', 'UTF-8'));
-        $this->assertSame(3, iconv_strlen('한국어', 'UTF-8'));
+//        $this->assertSame(3, iconv_strlen('한국어', 'UTF-8'));
 
         $this->assertSame(4, p::strlen2('déjà'));
         $this->assertSame(3, p::strlen2('한국어'));
diff --git a/tests/Mbstring/MbstringTest.php b/tests/Mbstring/MbstringTest.php
index bacaf3dbe..689e8b154 100644
--- a/tests/Mbstring/MbstringTest.php
+++ b/tests/Mbstring/MbstringTest.php
@@ -68,13 +68,13 @@ public function testInternalEncodingWithInvalidEncoding()
      */
     public function testConvertEncoding()
     {
-        $this->assertSame(utf8_decode('déjà'), mb_convert_encoding('déjà', 'Windows-1252'));
+        $this->assertSame(iconv('UTF-8', 'ISO-8859-1', 'déjà'), mb_convert_encoding('déjà', 'Windows-1252'));
         $this->assertSame(base64_encode('déjà'), mb_convert_encoding('déjà', 'Base64'));
         $this->assertSame('&#23455;<&>d&eacute;j&agrave;', mb_convert_encoding('実<&>déjà', 'Html-entities'));
         $this->assertSame('déjà', mb_convert_encoding(base64_encode('déjà'), 'Utf-8', 'Base64'));
         $this->assertSame('déjà', mb_convert_encoding('d&eacute;j&#224;', 'Utf-8', 'Html-entities'));
-        $this->assertSame('déjà', mb_convert_encoding(utf8_decode('déjà'), 'Utf-8', 'ASCII,ISO-2022-JP,UTF-8,ISO-8859-1'));
-        $this->assertSame('déjà', mb_convert_encoding(utf8_decode('déjà'), 'Utf-8', ['ASCII', 'ISO-2022-JP', 'UTF-8', 'ISO-8859-1']));
+        $this->assertSame('déjà', mb_convert_encoding(iconv('UTF-8', 'ISO-8859-1', 'déjà'), 'Utf-8', 'ASCII,ISO-2022-JP,UTF-8,ISO-8859-1'));
+        $this->assertSame('déjà', mb_convert_encoding(iconv('UTF-8', 'ISO-8859-1', 'déjà'), 'Utf-8', ['ASCII', 'ISO-2022-JP', 'UTF-8', 'ISO-8859-1']));
     }
 
     /**
@@ -567,7 +567,7 @@ public function testStrwidth()
     {
         $this->assertSame(3, mb_strwidth("\000実", 'UTF-8'));
         $this->assertSame(4, mb_strwidth('déjà', 'UTF-8'));
-        $this->assertSame(4, mb_strwidth(utf8_decode('déjà'), 'CP1252'));
+        $this->assertSame(4, mb_strwidth(iconv('UTF-8', 'ISO-8859-1', 'déjà'), 'CP1252'));
     }
 
     /**