Unclear The option may have moved somewhere else rather than being removed.
What
Claude Code used to attach an option called threadedContinue to its requests, and it was off unless something set it. That option is no longer passed. The separate option for skipping message cache markers is still passed as before.
Why
This looks like an experimental way of continuing a conversation being dropped from the request path.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The option may have moved somewhere else rather than being removed.