Preview unavailable coming in DevTools

Description

Getting Preview Unavailabe for post request.

Steps to reproduce

1. Open DevTools.
2. Call any post api with some payload.
3. In DevTools, network > Payload, [Preview unavailable] is coming.

React Native Version

0.83.1

Output of npx @react-native-community/cli info

System:
  OS: macOS 26.1
  CPU: (8) arm64 Apple M2
  Memory: 139.53 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.19.0
    path: /Users/ashish/.nvm/versions/node/v22.19.0/bin/node
  Yarn:
    version: 1.22.22
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.9.3
    path: /Users/ashish/.nvm/versions/node/v22.19.0/bin/npm
  Watchman:
    version: 2025.05.26.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/ashish/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.1
      - iOS 26.1
      - macOS 26.1
      - tvOS 26.1
      - visionOS 26.1
      - watchOS 26.1
  Android SDK: Not Found
IDEs:
  Android Studio: Not Found
  Xcode:
    version: 26.1/17B55
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.12
    path: /usr/bin/javac
  Ruby:
    version: 3.1.4
    path: /Users/ashish/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.2.0
    wanted: ^19.2.0
  react-native:
    installed: 0.83.1
    wanted: ^0.83.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

在 DevTools 中打开 Network > Payload，并发送一个带有 payload 的 POST 请求，以重现该问题。将受影响的请求与可用预览的请求进行比较；当 POST 请求的 payload 显示预览而不是“Preview unavailable”时即完成。