fix: catch canceled exceptions when Teleporting

[alejandro-jimenez-dcl]

Pull Request Description

What does this PR change?

Fixes Sentry issue UNITY-EXPLORER-NHG: System.Exception: Cancelled: OperationCanceledException reported from AsyncLoadProcessReport.WaitUntilFinishedAsync (70 events / 47 users since 2026-03-07).

Root cause: when a scene load operation returned EnumResult.CancelledResult(TaskError.Cancelled), LoadingScreen.ExecuteOperationAsync called loadReport.SetResult(result.AsResult()). SetResult wraps any failure into new Exception(errorMessage), converting the cancellation into a plain Exception whose message
is "Cancelled: OperationCanceledException". WaitUntilFinishedAsync's generic catch (Exception) branch then reported it to Sentry via ReportHub.LogException.

Fix: in LoadingScreen.cs:46-56, route the Cancelled state directly to loadReport.SetCancelled(), which propagates OperationCanceledException through the completion source. WaitUntilFinishedAsync catches OCE separately and does not report it to Sentry. All other paths still go through SetResult.

Test Steps

Check that teleporting work as expected.

Reproduction (optional, dev-only)

Enable the Abort Scene Loading debug widget (DEBUG panel), set Type to CANCEL and coords to a scene currently loading. Before the fix: Sentry exception fires. After the fix: silent cancellation, no exception.

Quality Checklist

• Changes have been tested locally
• Documentation has been updated (if required)
• Performance impact has been considered (none, single conditional branch)
• For SDK features: Test scene is included (n/a)

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	628b311
Logs	https://github.com/decentraland/unity-explorer/actions/runs/26286721953
Download Windows	https://github.com/decentraland/unity-explorer/suites/70312780125/artifacts/7160635630
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/async-load-report-cancel-noise/pr-22579-628b311/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/70312780125/artifacts/7160716292
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/async-load-report-cancel-noise/pr-22579-628b311/Decentraland_macos.zip
Built on	2026-05-22T12:44:33Z

[claude]

Claude finished @alejandro-jimenez-dcl's task in 3m 18s —— View job

---

Review Complete

• Gather context (diff, changed files)
• Load async-programming skill context
• Review fix logic and root cause
• Attempt test fix commit (blocked: repo requires signed commits)
• Post final review with inline suggestion

---

Root-Cause Check

Problem: LoadingScreen.ExecuteOperationAsync called loadReport.SetResult(result.AsResult()) for all results. For a CancelledResult, AsResult() converts the cancellation into Result.ErrorResult("Cancelled: OperationCanceledException"), which SetResult wraps into new Exception(...). WaitUntilFinishedAsync's generic catch (Exception) branch then reported it to Sentry via ReportHub.LogException.

Fix: The PR correctly routes TaskError.Cancelled to loadReport.SetCancelled(), which propagates OperationCanceledException through the UniTaskCompletionSource. WaitUntilFinishedAsync catches OCE separately and suppresses it silently. This is a genuine root-cause fix, not a workaround.

---

Blocking Issue

Missing test update — FixUpLoadingReportAsync will fail for the CancelledResult case

Explorer/Assets/DCL/SceneLoadingScreens/Tests/LoadingScreenShould.cs:65

Before the fix, CancelledResult went through SetResult → SetException, producing UniTaskStatus.Faulted. After the fix it goes through SetCancelled → TrySetCanceled, producing UniTaskStatus.Canceled. The existing assertion only distinguishes between Succeeded and Faulted:

// current — fails for CancelledResult
Assert.That(outerReport!.GetStatus().TaskStatus,
    result.Success ? Is.EqualTo(UniTaskStatus.Succeeded) : Is.EqualTo(UniTaskStatus.Faulted));

Required fix (line 64–65):

// Report must be modified by the loading screen
UniTaskStatus expectedStatus = result.Success
    ? UniTaskStatus.Succeeded
    : result.Error?.State is TaskError.Cancelled
        ? UniTaskStatus.Canceled
        : UniTaskStatus.Faulted;
Assert.That(outerReport!.GetStatus().TaskStatus, Is.EqualTo(expectedStatus));

Note: I attempted to commit this fix directly but the repository requires signed commits. Please apply the change above to Tests/LoadingScreenShould.cs.

Fix this →

---

REVIEW_RESULT: FAIL ❌
COMPLEXITY: COMPLEX
COMPLEXITY_REASON: Modifies async cancellation flow in the scene load pipeline, touching UniTaskCompletionSource state propagation.
QA_REQUIRED: YES

[m3taphysics]

PR #8858, run #26288527889

Builds: Windows change, Windows baseline, macOS change, macOS baseline

Framework 13 i7

Metric	Change	Baseline	Delta	Improvement
Samples	2701	2700
CPU average	33.3 ms	33.3 ms	-0.0 ms	0.0%	⚪
CPU 1% worst	33.4 ms	33.7 ms	-0.2 ms	0.7%	⚪
CPU 0.1% worst	33.8 ms	36.4 ms	-2.7 ms	7.3%	🟢
GPU average	7.8 ms	8.2 ms	-0.4 ms	4.7%	🟢
GPU 1% worst	19.4 ms	20.8 ms	-1.4 ms	6.6%	🟢
GPU 0.1% worst	24.8 ms	25.8 ms	-0.9 ms	3.6%	🟢

[DafGreco]

✔️ PR reviewed and approved by QA on both platforms following instructions playing both happy and un-happy path

Regressions for this ticket had been performed in order to verify that the normal flow is working as expected:

• [✔️ ] Backpack and wearables in world
• [✔️ ] Emotes in world and in backpack
• [✔️ ] Teleport with map/coordinates/Jump In
• [ ✔️] Chat and multiplayer
• [✔️ ] Profile card
• [✔️ ] Settings

Checks made 🚀
Teleported through:

1. Map ✔️
2. Jump in button ✔️
3. Commands on chat✔️
4. Jump in from friends panel ✔️
5. Teleport through jump in to genesis plaza button✔️

No new issues were found during this checkups