Windows OpenCode Desktop never sends prompts; TUI and Web work with the same local server

Description

Windows OpenCode Desktop never sends prompts; TUI and Web work with the same local server

Environment

• OS: Windows 11
• CLI version: 1.18.18
• Desktop: latest Windows installer, reinstalled cleanly
• Project: tested a brand-new default project and session
• Models/providers: confirmed working in TUI and Web
• MCP/plugins: disabled during reproduction

Reproduction

1. Launch OpenCode Desktop.
2. Set built-in Local Server as default.
3. Create a new session.
4. Send: Reply only with: ONE.
5. No response is displayed.

I also tested a manually started server:

opencode serve --hostname 127.0.0.1 --port 4097

Then I added http://127.0.0.1:4097 in Desktop and set it as default.
After sending a prompt in Desktop, the server terminal shows no request/activity.

Expected

Desktop should send the prompt to the server and display the streamed response.

Actual

Desktop accepts/shows the prompt but no model reply is produced. When using an explicit server URL, the server receives no request.

Controls that work

• opencode TUI: works for old and new sessions.
• opencode web: works for old and new sessions.
• All configured models and MCP tools, including Headroom MCP, work in TUI/Web.

Attempted fixes

• Cleared %USERPROFILE%\.cache\opencode
• Reset opencode.settings.dat, opencode.global.dat, and workspace state files
• Removed Desktop Electron caches
• Disabled custom config/MCP
• Rebooted Windows
• Repaired/reinstalled OpenCode Desktop
• Used built-in Local Server and an explicit standalone localhost server

Plugins

No response

OpenCode version

1.18.18

Steps to reproduce

Reproduction

1. Launch OpenCode Desktop.
2. Set built-in Local Server as default.
3. Create a new session.
4. Send: Reply only with: ONE.
5. No response is displayed.

I also tested a manually started server:

opencode serve --hostname 127.0.0.1 --port 4097

Then I added http://127.0.0.1:4097 in Desktop and set it as default.
After sending a prompt in Desktop, the server terminal shows no request/activity.

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

No response