Update CHANGELOG.md

Author: michalChrobot

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -6,6 +6,35 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 Additional documentation and release notes are available at [Multiplayer Documentation](https://docs-multiplayer.unity3d.com).
 
+## [Unreleased]
+
+### Added
+
+
+### Changed
+
+
+
+
+### Deprecated
+
+
+### Removed
+
+
+### Fixed
+
+- Issue with not being able to spawn initially disabled in-scene placed objects. (#4093)
+- Issue with pre-instantiated network prefab instances being marked as in-scene placed. Now pre-instantiated network prefabs are dynamically spawned. (#4093)
+- Issue where a user could spawn runtime created `NetworkObject` that has a GlobalObjectIdHash of zero. These are not valid instances and will no longer be allowed to spawn. (#4093)
+
+
+### Security
+
+
+### Obsolete
+
+
 ## [2.13.1] - 2026-07-19
 
 ### Added