[BUG]: Windows Desktop sidecar crashes with exitCode -2147483645, then "Failed to fetch"

Description

OpenCode Desktop starts normally on Windows and the local server initially becomes available, but after a short time the opencode server sidecar crashes.

The UI then reports TypeError: Failed to fetch.

The issue is reproducible on both 1.18.15 and 1.18.16, including with a completely empty local project outside OneDrive.

The logs show:

sidecar exited { code: 2147483651 }

child process gone {
reason: 'crashed',
exitCode: -2147483645,
serviceName: 'node.mojom.NodeService',
name: 'opencode server'
}

opencode serve works correctly when launched manually, and /global/health returns healthy = True.

I also reinstalled/updated Microsoft Edge WebView2 Runtime, with no change.
GitHub suggested #29599 as a possible duplicate, but that issue reports ACCESS_VIOLATION (0xC0000005) / AttachConsole failures, while this reproduction consistently exits with 0x80000003 (-2147483645).
GitHub also suggested #33069 as a possible duplicate, but that issue reports intermittent ACCESS_VIOLATION (0xC0000005) crashes approximately every 2 days. This issue reproduces within seconds/minutes and consistently exits with 0x80000003 (-2147483645).

opencode-OC-Test-logs.zip

Plugins

None

OpenCode version

1.18.15 and 1.18.16

Steps to reproduce

1. Create an empty local directory: C:\OC-Test
2. Open C:\OC-Test as a project in OpenCode Desktop.
3. Wait for the local server to start.
4. After a short time, session loading fails with "Failed to fetch".
5. utility.log shows that the opencode server sidecar crashed with exitCode -2147483645.

Screenshot and/or share link

Operating System

Windows 11 Business 24H2 (OS Build 26100.8893)

Terminal

Windows PowerShell