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Android Studio Rabbit 2 Canary 5 fixes L8 desugaring wiping the R8 mapping file

The per-variant l8DexDesugarLib task rewrote a full mapping.txt as a 25-byte stub.

Updated

Android Studio Rabbit 2 Canary 5, released October 15, 2026, fixes a bug in which the per-variant l8DexDesugarLib task destroyed the obfuscation mapping: it read the full mapping.txt, about 366 MB in the reported case, and rewrote it as a 25-byte "# L8 Desugaring Mapping" stub.

The release notes list these other general fixes:

  • android describe failing in macrobenchmark and baselineprofile modules.
  • Compose Preview selecting all views and composables initially.
  • A Compose Preview with the same function name running with an existing run configuration.
  • A Figma MCP authorization failure showing no "Start Login" action.
  • The "Show Toolbar" option missing from the Android Emulator's three-dot menu.

The notes give an issue number for each fix but no detail on how it was fixed.

Sources

  1. Android Studio Rabbit 2 Canary 5 now available Primary Android Studio Releases
Android Studio Developer Tools Release Notes

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