[Bug] Desktop app: provider/model/MCP fail to load on startup

Summary

The Opencode desktop app is unusable since it fails to load provider/model/MCP information during roughly 80% of application starts for multiple users in my organization. This is a version regression: v1.18.4 works correctly; every version from v1.18.5 through v1.18.13 is broken. Downgrading to v1.18.4 fixes the issue. Windows 11 Enterprise.

On affected starts, a stack of toast errors appears immediately — one "Failed to reload [name]: UnsupportedContentType" and one "Failed to reload [name]: Cannot read properties of undefined (reading 'temperature')" per configured provider/MCP:

Environment

• Custom providers via @ai-sdk/openai-compatible (no built-in API keys)
• Last known good version: v1.18.4
• First broken version: v1.18.5
• Confirmed still broken: v1.18.13

Symptoms

• Renderer: Failed to finish bootstrap instance TypeError: Cannot read properties of undefined (reading 'temperature')
• Toast: "Failed to reload [ProjectName] — UnsupportedContentType"
• Toast: "Failed to reload [ProjectName] — Cannot read properties of undefined (reading 'temperature')"
• Provider list empty, MCP list empty, model selector shows nothing

Renderer logs (crash sessions)

[2026-07-31 08:41:55.871] [error] Failed to finish bootstrap instance TypeError: Cannot read properties of undefined (reading 'temperature')
[2026-07-31 08:30:51.103] [error] Failed to finish bootstrap instance TypeError: Cannot read properties of undefined (reading 'temperature')
[2026-07-29 17:15:46.086] [error] Failed to finish bootstrap instance TypeError: Cannot read properties of undefined (reading 'temperature')

Sidecar log (no errors during crash)

timestamp=2026-07-31T12:41:41.058Z level=INFO message=loading path="...opencode.jsonc"
timestamp=2026-07-31T12:41:44.176Z level=INFO message=bootstrapping directory="...WinISO-Builder"
timestamp=2026-07-31T12:41:44.229Z level=INFO message=init

Config loads at :41.058, init completes at :44.229. Renderer crash logged at :55.871, well after init completes.

What I tried

• OPENCODE_DISABLE_MODELS_FETCH=1 — did not fix
• OPENCODE_DISABLE_AUTOUPDATE=1 — did not fix
• autoupdate: false in opencode.jsonc — did not fix
• Relaunching repeatedly — Works every so often
• Downgrading to v1.18.4 — fixed