User message rendered twice in agent thread with Thinking indicator between duplicates

[AlexanderVoid45]

Reproduction steps

To reproduce: send messages in an agent thread during a normal workflow. The duplication happens intermittently and started appearing after updating Zed. I have not found a reliable way to trigger it on demand.

Current vs. Expected behavior

When sending a message in an agent thread, the message sometimes appears twice. The duplicate shows up below a "Thinking" indicator, as if it was sent again. The agent does not react to the duplicate and only processes the message once, so this appears to be purely a frontend rendering bug that does not affect the actual conversation context.I did not experience this issue on v0.225.9 or earlier versions. It started appearing after updating to v0.226.4, so it is likely a regression introduced in this release.

Expected behavior: the user message should appear only once in the thread.

Zed version and system specs

Environment: Zed v0.226.4 (175cfdc), macOS Tahoe (Apple Silicon), Claude Agent.

Attach Zed log file

Zed.log

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

None

[tonku321]

I think it's related agentclientprotocol/claude-agent-acp#381

[AlexanderVoid45]

I think it's related zed-industries/claude-agent-acp#381

Thanks, this looks like the same issue. I searched for it before filing but did not find that thread. I was approaching it as a frontend rendering problem so my search terms were different.

[TwistingTwists]

this is merged - agentclientprotocol/claude-agent-acp#385 . should be available in next release.