Modal UI breaks when using align related CSS properties

[sanyam12]

Description

When the child view of a modal is given alignItems: 'center' or justifyContent: 'center' the UI breaks while the modal is opens.

I could reproduce this behaviour when the modal contains an Image or an SVG, but I've also seen text flickers in the same manner.

While the flicker is prominent in New Architecture, it is also occurring in legacy when trying multiple times.

Steps to reproduce

1. Make a modal with child view having alignItems: 'center'
2. Add an Image and a Text to the child View
3. Flicker occurs when the modal is opened.

React Native Version

0.80.2

Affected Platforms

Runtime - Android

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

System:
  OS: macOS 15.5
  CPU: (8) arm64 Apple M1
  Memory: 178.75 MB / 8.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.18.1
    path: ~/.nvm/versions/node/v20.18.1/bin/node
  Yarn:
    version: 3.6.4
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.8.2
    path: ~/.nvm/versions/node/v20.18.1/bin/npm
  Watchman:
    version: 2025.03.10.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.5
      - iOS 18.5
      - macOS 15.5
      - tvOS 18.5
      - visionOS 2.5
      - watchOS 11.5
  Android SDK:
    API Levels:
      - "28"
      - "29"
      - "31"
      - "32"
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 28.0.3
      - 30.0.3
      - 33.0.1
      - 34.0.0
      - 35.0.0
    System Images:
      - android-34 | Google APIs ARM 64 v8a
      - android-UpsideDownCakePrivacySandbox | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2024.2 AI-242.23339.11.2421.12550806
  Xcode:
    version: 16.4/16F6
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.1
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 19.1.1
    wanted: 19.1.1
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native:
    installed: 0.80.2
    wanted: 0.80.2
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

Not applicable, since it is a UI bug and nothing is logged as crash

MANDATORY Reproducer

https://github.com/sanyam12/ModalFlicker

Screenshots and Videos

Screen.Recording.2025-07-30.at.10.40.56.PM.mov

Current Behaviour: Modal content is first displayed in top right corner, then at it's intended position.
Expected Behaviour: Modal content should be displayed in the center without any flicker.

[devanshsaini11]

@sanyam12 Can you confirm if this #52676 fixes this?

[sanyam12]

thank for the reply @devanshsaini11

I tried the same reproducer with react-native v0.77.3 and flicker isn't occurring at top left of screen, but rather a small upward displacement. I'll keep looking at different approaches which might cause flickering again.

Screen.Recording.2025-07-31.at.10.19.01.PM.mov

However, I intended to find a solution for v80. Any idea when would this be fix be released for latest version?

[kowsickram24]

thank for the reply @devanshsaini11

I tried the same reproducer with react-native v0.77.3 and flicker isn't occurring at top left of screen, but rather a small upward displacement. I'll keep looking at different approaches which might cause flickering again.

Screen.Recording.2025-07-31.at.10.19.01.PM.mov
However, I intended to find a solution for v80. Any idea when would this be fix be released for latest version?

This issue is still not resolved,, in version 0.73.6 there is no issue

[react-native-bot]

This issue is stale because it has been open for 180 days with no activity. It will be closed in 7 days unless you comment on it or remove the "Stale" label.

[react-native-bot]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.