Animated JXL images do not animate

(#4191) Bug Open: Needs triage desktop media mobile

Reproduction steps

  1. Send an animated JXL
  2. Watch it magically turn into a static image

Expected behaviour

The animation should play

Actual behaviour

The image becomes static

Build information

Stable Desktop 2026.1018.223338, Web 2026.1018.223338, Linux 7.2.11-200.fc44.x86_64 (x64), Electron 44.4.1, Chrome 152.0.7977.78, Node 24.21.0, Locale en-US

Platform

macOS, Windows, Linux, Web, Android, iOS

Evidence

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