Update CHANGELOGs

Author: keveleigh

org.mixedrealitytoolkit.core/CHANGELOG.md

@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 * Updated the minimum editor version to 6000.0.66f2 [PR #1112](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1112)
 * Updated code style in `HandsSubsystemDescriptor`, `MRTKSubsystemDescriptor`, `DictationSubsystemDescriptor`, and `XRSubsystemHelpers`. [PR #1109](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1109)
+* Updated `ReserializeUtility` to remove unused prefab overrides. [PR #1126](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1126)
 
 ### Fixed
 

org.mixedrealitytoolkit.uxcomponents.noncanvas/CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Changed
 
 * Updated the minimum editor version to 6000.0.66f2 [PR #1112](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1112)
+* Reserialized prefabs, materials, and animations to remove stale serialized fields. [PR #1126](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1126)
 
 ## [4.0.0-pre.2] - 2025-12-05
 

org.mixedrealitytoolkit.uxcomponents/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## Unreleased
+
+### Changed
+
+* Reserialized prefabs and materials to remove additional stale serialized fields. [PR #1126](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1126)
+
 ## [4.0.0-pre.3] - 2026-05-20
 
 ### Changed