Before you continue
Before submitting a bug report, please review our troubleshooting documentation at https://developer.amazon.com/docs/kepler-tv/troubleshoot-overview.html.
If you still want to file a bug report, please make sure to fill in all the details below and provide the necessary information.
NOTE: PLEASE ONLY REPORT A SINGLE BUG USING THIS TEMPLATE.
If you’re experiencing multiple issues, please file a separate report for each.
Bug Description
1. Summary
I am reoppening the issue reported in this ticket - https://community.amazondeveloper.com/t/bug-flatlist-focus-gets-lost-when-using-flatlist-with-numcolumns/11074
We are having issues with using flatList infinite pagination (using onEndReached) along with numColumns, whenever new data is added to the flatlist’s data prop, the data gets rendered but at the same time app loses the focus. If we press a d-pad button to bring back the focus, it goes to a random focusable element and does not go back to the previously focused item.
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Screen-Record of the Bug - https://drive.google.com/file/d/1Ipk0ShoTwEzfqgxZPnH8yJoNowyXmzTS/view?usp=sharing
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Minimal reproduction kepler app - https://drive.google.com/file/d/1QMSisebMA5Q2GnLKUq-wv7LtpcOXA8Pd/view?usp=sharing
App Name:
App Link on Amazon Appstore (found through Developer Console → Actions column in App List → View on Amazon.com):
Bug Severity
Select one that applies
- Impacts operation of app
- Blocks current development
- Improvement suggestion
- Issue with documentation (If selected, please share the doc link and describe the issue)
- Other
2. Steps to Reproduce
- Create a Flatlist Grid using
numColumns. - Enable it to have infinite scrolling by adding more data to the list using
onEndReached - Observe the behaviour when you reach the end and more data is rendered in the list.
3. Observed Behavior
Explain what actually happened, noting any discrepancies or malfunctions.
When more data is added to the list on `onEndReached`, the focus gets lost.
4. Expected Behavior
Describe what you expected the SDK to do under normal operation.
Focus should stay at the currently focused component
4.a Possible Root Cause & Temporary Workaround
Fill out anything you have tried. If you don’t know, N/A is acceptable
1. Tried fixing it by making the changes suggested in this thread - https://github.com/facebook/react-native/pull/43205
2. Tried the solutions discussed in this - https://community.amazondeveloper.com/t/bug-flatlist-focus-gets-lost-when-using-flatlist-with-numcolumns/11074
5. Logs or crash report
(Please make sure to provide relevant logs as attachment and share VPKG file with your Amazon contact)
For crash issues, please refer this guide for faster troubleshooting: https://developer.amazon.com/docs/kepler-tv/detect-crash.html.
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For issues with Kepler Studio Extension, please share log files from below folders:
~/.vscode/extensions/amazon.kepler-extension-<version>/ExtensionLogs ~/.vscode/extensions/amazon.kepler-ui-extension-<version>/ExtensionLogs
6. Environment
Please fill out the fields related to your bug below:
- SDK Version: 0.20.2975
- App State:
Foreground - OS Information
Please ssh into the device viakepler exec vda shelland copy the output fromcat /etc/os-releaseinto the answer section below. Note, if you don’t have a simulator running or device attachedkepler exec vda shellwill respond withvda: no devices/emulators found
NAME="OS"
OE_VERSION="4.0.0"
OS_MAJOR_VERSION="1"
OS_MINOR_VERSION="1"
RELEASE_ID="2"
OS_VERSION="1.1"
BRANCH_CODE="VegaMainlineTvIntegration"
BUILD_DESC="OS 1.1 (VegaMainlineTvIntegration/1037420)"
BUILD_FINGERPRINT="1.0.3742.0(9a1d8dfa7da5d600)/1037420N:user/dev-keys"
BUILD_VARIANT="user"
BUILD_TAGS="dev-keys"
BUILD_DATE="Sun Jul 06 22:51:18 UTC 2025"
BUILD_TIMESTAMP="1751842278"
VERSION_NUMBER="201113742030"
7. Example Code Snippet / Screenshots / Screengrabs
Include any relevant code or component setup in React Native that can help reproduce the bug.
- Download Minimal kepler app with the bug - https://drive.google.com/file/d/1QMSisebMA5Q2GnLKUq-wv7LtpcOXA8Pd/view?usp=sharing
- Install dependancies and run the app.
- Observe the behaviour when you reach the end of the list and more data is added.
Playback Issues
If this is a playback issue, please provide your VPKG and/or content URL, any pre-conditions (like geo-location) [Share privately with your Amazon contact] , and let us know if it’s x86 or arm7.
<!-- Describe your playback issue if applicable -->
Please share the following details in addition:_
- Player SDK:
[Bitmovin, Shaka, ...] - Player SDK Version:
[e.g. 1.23]- Audio Codecs:
[AAC, ...] - Video Codecs:
[h.264, mp4] - Manifest Types:
[m3u8, dash, etc ..]
- Audio Codecs:
Q: Would you like to be contacted to share your latest VPKG compiled with latest SDK:
[Y/N] [Share privately with your Amazon contact]
Q: VPN or Login needed to verify functionality in VPKG?
[Y/N] [Share privately with your Amazon contact]
Q: If applicable, please provide your media/content url
If this is created dynamically, tokenized, etc please provide a way for us to access it
[N/A or Content / Media Url for testing] [Share privately with your Amazon contact]
Q: Are there any special headers required to reproduce the issue you are facing?
[N/A or Insert Headers]
Additionally please provide the following if possible
Provide Screenshots / Screengrabs / Logs. Please include as much information as you can that will help debug.
<!-- Answer here if applicable -->
Additional Context
Any Additional Context you would like to provide?
Add any other relevant information, such as recent updates to the SDK, dependencies, or device OS that may affect the bug.
<!-- Answer here if applicable -->