diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5161707e30f..7ef7a6b61e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Release Notes for Craft CMS 4
 
+## Unreleased
+
+- Fixed a bug where `craft\helpers\App::env()` and `normalizeValue()` could return incorrect results for values that looked like floats. ([#15533](https://github.com/craftcms/cms/issues/15533))
+
 ## 4.11.3 - 2024-08-13
 
 - Fixed a bug where the system name in the control panel’s global sidebar was getting hyperlinked even if the primary site didn’t have a URL. ([#15525](https://github.com/craftcms/cms/issues/15525))
diff --git a/src/helpers/App.php b/src/helpers/App.php
index 2073c86ce85..f3a0035fc01 100644
--- a/src/helpers/App.php
+++ b/src/helpers/App.php
@@ -435,12 +435,26 @@ public static function extensionVersion(string $name): string
      */
     public static function normalizeValue(mixed $value): mixed
     {
-        return match (is_string($value) ? strtolower($value) : $value) {
-            'true' => true,
-            'false' => false,
-            'null' => null,
-            default => Number::isIntOrFloat($value) ? Number::toIntOrFloat($value) : $value,
-        };
+        if (is_string($value)) {
+            switch (strtolower($value)) {
+                case 'true':
+                    return true;
+                case 'false':
+                    return false;
+                case 'null':
+                    return null;
+            }
+
+            if (Number::isIntOrFloat($value)) {
+                $intOrFloat = Number::toIntOrFloat($value);
+                // make sure we didn't lose any precision
+                if ((string)$intOrFloat === $value) {
+                    return $intOrFloat;
+                }
+            }
+        }
+
+        return $value;
     }
 
     /**
diff --git a/tests/unit/helpers/AppHelperTest.php b/tests/unit/helpers/AppHelperTest.php
index 3ff5238fd64..2ad35323915 100644
--- a/tests/unit/helpers/AppHelperTest.php
+++ b/tests/unit/helpers/AppHelperTest.php
@@ -550,6 +550,7 @@ public function normalizeValueDataProvider(): array
             [123.4, '123.4'],
             ['foo', 'foo'],
             [null, null],
+            ['2833563543.1341693581393', '2833563543.1341693581393'], // https://github.com/craftcms/cms/issues/15533
         ];
     }