FlatList re-mount all the row when using columns

Description

Regardless of the use of optimization techniques, such as React.memo or useCallback, when a FlatList with columns (numColumns > 1) is created and an element is added or removed from the list, this causes all components of the row where the element was added or removed to be re-mounted. This is easily noticeable if entry animations are used (but it has other serious repercussions). I'm currently stuck in development on this issue (and switching to unsare scroll view would make the app unusable). There are many similar issues by now, all closed without any discussion or solution, and since it has been years now I think it is time to take the problem into consideration.

Steps to reproduce

1. configure a Flatlist with numColumns > 1 2) add dynamically a new item or remove an item 3) all the items of the row addicted are re-mounted

React Native Version

0.74.3

Affected Platforms

Runtime - Android, Runtime - iOS

Output of npx react-native info

System:
  OS: macOS 14.5
  CPU: (8) arm64 Apple M2
  Memory: 127.25 MB / 8.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.4.1
    path: /opt/homebrew/bin/node
  Yarn:
    version: 1.22.19
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.8.2
    path: /opt/homebrew/bin/npm
  Watchman:
    version: 2024.07.01.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /Users/niccolocaselli/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.5
      - iOS 17.5
      - macOS 14.5
      - tvOS 17.5
      - visionOS 1.2
      - watchOS 10.5
  Android SDK:
    Android NDK: 22.1.7171670
IDEs:
  Android Studio: 2023.2 AI-232.10300.40.2321.11567975
  Xcode:
    version: 15.4/15F31d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/niccolocaselli/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.74.3
    wanted: 0.74.3
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: false

Stacktrace or Logs

no crash

Reproducer

https://snack.expo.dev/@niccolocase/0aa680

Screenshots and Videos

https://github.com/user-attachments/assets/891e73d0-d77f-4b3e-8beb-5a1fe60c5a82

Start with the linked Snack reproducer and the FlatList configuration using numColumns greater than one. Reproduce an insertion and removal while observing row mounts on Android and iOS. Done means the affected row's existing items are not re-mounted during these updates, with the behavior verified against the reported React Native version.