#16031 [bug] Android: custom plugin events never reach `addPluginListener` JS callbacks when tauri-codegen + tauri-macros are 2.6.x (works with 2.5.5)

Describe the bug

On Android, events emitted by a custom plugin never reach their JavaScript listeners. Registration succeeds, the native side fires and delivers the event, but the JS callback registered with addPluginListener is never invoked. No error is thrown.

This is a regression correlated with the tauri-codegen / tauri-macros version pair:

`tauri-codegen` / `tauri-macros`	Result
2.5.5 / 2.5.5	✅ JS listeners fire
2.6.3 / 2.6.3	❌ JS listeners never fire

The tauri crate stayed at 2.10.1 (and 2.10.3) throughout. The JS code, the plugin revision, and the generated Android project were unchanged between the two runs.

Reproduction

Android Tauri v2 app, tauri pinned 2.10.1, tauri-build 2.5.6.
Custom Android plugin (music-notification) that emits events from a native BroadcastReceiver when the Android media session's Next action is dispatched.

In JS, register listeners on mount:

await Promise.all([
  onPlay(...), onPause(...), onNext(...), onPrev(...),
  onPreviousAlbumNeeded(...), onQueueEnded(...),
]);
// implemented as: core.addPluginListener("music-notification", "onNext", cb)

Press Play, then trigger Next from the media notification (or call the plugin's next() command directly — both reproduce).

Switch the dependency pair and repeat:

cargo update -p tauri-codegen --precise 2.5.5
cargo update -p tauri-macros  --precise 2.5.5   # listeners fire (fixed)
cargo update -p tauri-codegen --precise 2.6.3
cargo update -p tauri-macros  --precise 2.6.3   # listeners dead (broken)

Note: with tauri = "=2.10.1", a fresh resolve picks 2.6.3 for this pair automatically — no tauri upgrade is needed to trigger the bug.

Plugin source: https://github.com/AverTry/tauri-plugin-music-notification (revision 21ed5d7b42ea14832e09cdb204bcfbc957313937, consumed as a local path dependency). The Kotlin service sends a local broadcast; the plugin's BroadcastReceiver.onReceive receives it and triggers the event.

Expected behavior

With tauri-codegen/tauri-macros 2.6.3, the JS callback should fire exactly as it does with 2.5.5. Native event emission is identical in both cases.

Full `tauri info` output

**Broken (codegen/macros 2.6.3)** — native emits, plugin receives, JS is silent:


D/MusicPlayerService: Sent broadcast: eventName=onNext, action=next, currentIndex=5, isPlaying=false, trackId=5
D/MusicNotificationPlugin: BroadcastReceiver.onReceive called with action: MUSIC_NOTIFICATION_EVENT
D/MusicNotificationPlugin: Event received: eventName=onNext, action=next, currentIndex=5, isPlaying=false, trackId=5



[AUDIO] >>> all 6 listeners registered        // ← no "onNext FIRED" ever follows


**Working (codegen/macros 2.5.5)** — identical native side, and the JS callback runs:


D/MusicNotificationPlugin: Event received: eventName=onNext, action=next, currentIndex=5, isPlaying=true, trackId=5



[AUDIO] onNext FIRED [object Object]
[AUDIO] onNext -> handleAudioPageChange(1)


User-visible effect: the reader screen does not advance when Next is pressed.

Stack trace

No exception or Rust panic is produced. There is no ACL/permission error at event
delivery time. The only unusual console output is this, present in both working and
broken runs and believed unrelated to the regression:


Uncaught (in promise) notification.is_permission_granted not allowed on window "main",
webview "main", URL: about:blank
referenced by: capability: default / mobile-capability, permission: allow-is-permission-granted

Additional context

Exact dependency set (identical in both runs unless stated):

tauri = { version = "=2.10.1", features = ["protocol-asset"] }
tauri-build = { version = "=2.5.6", features = [] }
tauri-runtime = "=2.10.1"
tauri-runtime-wry = "=2.10.1"

Resolved, and identical in both the working and broken runs:

tauri              2.10.1
tauri-build         2.5.6
tauri-runtime       2.10.1
tauri-runtime-wry   2.10.1
tauri-utils         2.9.3
tauri-plugin        2.5.4
@tauri-apps/api     ⟨version⟩
@tauri-apps/cli     ⟨version⟩

The only variables between working and broken are tauri-codegen and tauri-macros (2.5.5 → 2.6.3).

Other things already ruled out by testing:

tauri crate: 2.10.1 and 2.10.3 both reproduce. tauri 2.11.x reproduces.
tauri-utils: 2.8.3 and 2.9.3 both fine.
tauri-plugin: stayed at 2.5.4 the whole time.
JavaScript side: untouched between runs.
tauri-runtime / tauri-runtime-wry: forced to 2.10.1 via direct exact dependencies, which does not fix it.
Not a lockdown/ACL error — registration is not rejected, the event is simply not delivered to the registered JS callback.

Environment:

OS: Windows ⟨11pro⟩
Target: Android aarch64-linux-android
Device/OS: ⟨s10+l, 12⟩
Dev vs release build: ⟨both⟩
Frontend: SolidJS + Vite

Request: I've isolated this to the version pair but don't know the mechanism. Given that tauri 2.10.x will pull tauri-codegen/tauri-macros 2.6.x on a fresh resolve, it would be good to know whether that combination is intended to be supported. Happy to test proposed fixes or cut a minimal reproduction repo.

Workaround for now: pin both to =2.5.5 and keep Cargo.lock committed.


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