What
When Claude Code replies to a comment on an artifact or marks one resolved, it first checks whether the page keeps its own comment threads. If it cannot read that, it now refuses with a message saying nothing was posted or resolved. It also asks for the page to be read back.
Why
If this check cannot be completed, replies and resolves now fail safely. Nothing gets posted or resolved in the wrong place.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
What causes the comment-thread check to fail was not stated.