[#2582] added required changelog entry

Signed-off-by: Stefan Gehrig <stefan.gehrig.hn@googlemail.com>

Author: sgehrig

CHANGELOG.md

@@ -21,6 +21,9 @@ a release.
 ### Changed
 - All: Removed the dollar sign from the generated cache ID for extension metadata to ensure only characters mandated by [PSR-6](https://www.php-fig.org/psr/psr-6/#definitions) are used, improving compatibility with caching implementations with strict character requirements (#2978)
 
+### Fixed
+- Tree: Fixed inserting multiple root nodes in one flush operation with the nested set strategy in certain circumstances (#2582)
+
 ## [3.22.0] - 2025-12-13
 ### Added
 - Support for Symfony 8