Assistant response re-rendered after turn ends without user input (Opus 4.7)

Description

After the assistant finishes a turn, its response is re-rendered in the terminal without any user input. The duplicated block includes the status header ([Opus 4.7] <cwd>, ▶▶ accept edits on (shift+tab to cycle)) followed by the full response content repeated below the original. This did not happen before switching to Opus 4.7.

Environment

• Claude Code version: 2.1.117
• Model: Opus 4.7 (via Bedrock)
• Platform: macOS (Darwin 25.4.0)
• Shell: zsh
• Terminal: iTerm2

Relevant settings (sanitized):

{
  "model": "us.anthropic.claude-opus-4-7",
  "env": {
    "CLAUDE_CODE_USE_BEDROCK": "1",
    "ANTHROPIC_MODEL": "us.anthropic.claude-opus-4-7"
  }
}

Steps to reproduce

1. Start a session with Opus 4.7 on Bedrock
2. Send any prompt
3. Wait for the response to complete
4. Observe: the response is re-rendered below itself without pressing any key or submitting input

Expected behavior

Response is rendered once at end of turn; the CLI waits for user input.

Actual behavior

Response appears twice in the scrollback: first as the normal turn output, then repeated below with the status banner above the duplicate.

Notes

• Did not occur on Opus 4.6.
• No custom UserPromptSubmit / Stop / SessionStart hooks are configured.
• Existing PreToolUse / PostToolUse hooks do not print to stdout.