[Bug]: Feature Flag Display Issue #21085
Description
Describe the bug
Symptoms:
- Swaps button is greyed out or missing on MetaMask Mobile.
- Bridge button appears even though it should be merged/removed in newer builds.
- Perps and DeFi tabs are missing.
- No swap CTAs on individual asset detail screens.
Suspected root cause:
- Feature flag/LaunchDarkly (LD) dependency for rendering CTAs failing or returning unexpected values.
- Potential caching or fetch issues with client-config API.
- Possible confusion between bridgeConfig and bridgeConfigV2.
- Defaults may not be “safe” (i.e., Swaps should default ON for popular networks if LD is down or slow).
- Crosschain API uses a separate LD project which might also be affecting behavior.
Evidence/diagnostics:
- Users asked to share state logs (via long-press fox on password screen) and to fetch the client-config flags endpoint from device.
- At least one user provided state logs and API response.
- A PR (20947) was referenced that removes LD dependency for rendering CTAs, which should help, but may not fully cover this case.
Actions/next steps proposed:
- Ensure sane defaults: Swaps ON by default for popular networks; fallback paths if LD/client-config fails.
- Consider baking a snapshot of client-config (and possibly crosschain API) into the build as a fallback.
- Investigate client-config caching and bridgeConfig vs bridgeConfigV2 selection.
- Check Mixpanel to quantify impact on swap frequency in production.
- Team to follow up on Monday with the new reproduction details and collected logs. (edite
Expected behavior
No response
Screenshots/Recordings
No response
Steps to reproduce
- Issue seems related to app startup/login timing; re-logging in sometimes restores Swaps/Perps temporarily.
- Killing the app didn’t help for some users.
- On app load, there’s a brief flicker where Swap/Bridge CTAs appear before feature flags load, suggesting flags may be overriding defaults.
- One user couldn’t reproduce after updating to 7.56.5, but another still sees the issue, so it’s intermittent.
Error messages or log output
Detection stage
In production (default)
Version
7.56.5
Build type
Other (please specify exactly where you obtained this build in "Additional Context" section)
Device
iOS & Android
Operating system
iOS, Other (please elaborate in the "Additional Context" section)
Additional context
- Observed on v7.56.4 (2668) and still occurring for some on v7.56.5.
- iOS (e.g., iOS 18.6.2) and Android (e.g., Xiaomi) — not device-specific.
- Reproduced across multiple networks (Ethereum, Linea, Optimism, Polygon, Avalanche, Arbitrum, BNB, Base) and with “All Networks.”
Severity
No response