Tauri Service: CrabNebula driver fails to create sessions on macOS 26.4 (macos-26 runner image)

[goosewobbler]

Which area does this affect?

Tauri Service (@wdio/tauri-service) — CrabNebula provider

Problem

On the GitHub macos-26-arm64 runner image 26.4, the CrabNebula tauri-driver can no longer create WebDriver sessions. The test-runner-backend starts and logs Listening … / ready and CN_API_KEY is accepted, but the session's initial request fails:

WebDriverError: failed to send request: Request failed after 3 retries when running "window" with method "GET"

This reproduces across every suite (standard/window/multiremote/standalone/deeplink), 0 passed.

Regression window (points to the runner image, not our code)

• Green: macos-26-arm64 image 20260630.0213 (2026-07-03).
• Red: macos-26-arm64 image 20260715.0248 — macOS 26.4 (25E246), ~2026-07-15 onward.
• No change to our test code or the pinned driver versions between those dates. Windows/Linux Tauri are unaffected.

Versions

• @crabnebula/tauri-driver 2.0.9, @crabnebula/test-runner-backend 0.2.8
• WebdriverIO 9.29.1

Status

Blocked on CrabNebula (closed-source driver — no public tracker). Escalating via the CrabNebula Discord Tauri support channel.

Related

• Broader macOS-26.4 CI impact + our interim allow-fail handling: macOS Tauri E2E broken by macos-26 image (26.4): CrabNebula driver (#541) + embedded standalone cold-webview #540
• Separate CrabNebula-on-macOS logging bug: Tauri Service: Support logging when using CrabNebula on MacOS #179