Parent Component's layout props not forwarded to the child component

Problem Description

In the RNTester app, A component which will adjust font size based on layout height is not working cause when modifying the parent layout prop it is not getting reflected in the child layout.

The changes have to be made in FabricUIManager.cpp I believe

screenshare video:

https://github.com/user-attachments/assets/ade42fb4-189b-4a3f-ab36-dd7275e1d24e

Steps To Reproduce

It can be checked in RN tester App Fabric

Expected Results

The fontSize should be adjusted according, to the height.

After this #14519 pull request got merged.

CLI version

15.0.0-alpha.2

Environment

System:
  OS: Windows 11 10.0.26100
  CPU: "(16) x64 AMD EPYC 7763 64-Core Processor                "
  Memory: 44.96 GB / 63.95 GB
Binaries:
  Node:
    version: 22.14.0
    path: C:\Program Files\nodejs\node.EXE
  Yarn:
    version: 1.22.22
    path: C:\ProgramData\global-npm\yarn.CMD
  npm:
    version: 10.9.2
    path: C:\Program Files\nodejs\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK: Not Found
  Windows SDK:
    AllowDevelopmentWithoutDevLicense: Enabled
    Versions:
      - 10.0.19041.0
      - 10.0.22621.0
IDEs:
  Android Studio: Not Found
  Visual Studio:
    - 17.13.35931.197 (Visual Studio Enterprise 2022)
Languages:
  Java: Not Found
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli": Not Found
  react: Not Found
  react-native: Not Found
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Community Modules

No response

Target Platform Version

None

Target Device(s)

No response

Visual Studio Version

None

Build Configuration

None

Snack, code example, screenshot, or link to a repository

No response

Start with packages/@react-native/tester/js/examples/Text/TextAdjustsDynamicLayoutExample.js and FabricUIManager.cpp, then reproduce the behavior in the RNTester Fabric app. Trace why a parent layout-prop change is not reflected in the child after #14519. Done means the child receives the updated layout height and the example adjusts its font size as expected.