Can an OpenAPI v3 schema change be safely reverted without breaking generated clients?

When an OpenAPI v3 definition is updated with a breaking schema change, teams often need to revert to the previous contract quickly. The specification itself offers no native rollback keyword or state machine, and tools such as Swagger UI and code generators consume the current spec without tracking prior versions automatically. While platforms like SwaggerHub maintain version history, their rollback semantics are limited to restoring an earlier spec snapshot rather than validating that the reverted contract remains compatible with already generated clients.

The core uncertainty is how to design the spec and surrounding workflow so that reverting a schema change does not silently break downstream consumers. Because OpenAPI v3 treats schema definitions as mutable documents, there is no built-in mechanism to signal which version is authoritative or to enforce backward compatibility during a revert.

Can a Swagger/OpenAPI definition be structured to make a post-change rollback safe for existing clients? Which documented features in OpenAPI v3 or SwaggerHub can help preserve backward compatibility when reverting a schema? What verification steps are required before redeploying a reverted spec to production?