> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sqd.dev/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
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> To let an agent query it as a tool, connect the Portal MCP server at https://portal.sqd.dev/mcp.
> Every page on this site is available as Markdown by appending .md to its URL.

# E2427

> Google PubSub target — Finalized-only signal from an unfinalized block

A route declaring `fork.mode: 'finalized-only'` mapped a block above the dataset's finalized head.
That mode is a promise that the route publishes nothing a fork could orphan, and a signal cannot be
retracted once it is on the wire.

**Fix** — read the finalized stream, withhold the signal until its block finalizes, or switch the
route to `fork.mode: 'boundary'` and publish a compensating boundary message on a fork.


## Related topics

- [E2427](/en/sdk/pipes-sdk/errors/E2427.md)
- [Error reference](/en/sdk/pipes-sdk/errors.md)