Codex seems to be having a stroke if we go by its thoughts

What version of Codex is running?

codex-cli 0.53.0

What subscription do you have?

Plus

Which model were you using?

gpt-5-code medium

What platform is your computer?

Darwin 24.5.0 arm64 arm

What issue are you seeing?

When using the built-in /review slash command, the thoughts panel consistently shows word/phrase duplication:

• "Reviewinging code code difference difference"
• "Requestinging differences differences for for review review"
• "Requestinging more more diff diff content content"
• "Checking for for other other file file differences differences"
• "Checking for for dif diffsfs in in forms forms router router"

Frequency: Happens every time for the past few days
Started: Approximately last three days - was working normally before that
Persistence: Restarting Codex does not fix the issue
Impact: Uncertain if this affects actual code review quality or is purely cosmetic

What steps can reproduce the bug?

1. Open Codex in a git repository with uncommitted changes
2. Run the built-in /review slash command
3. Observe the thoughts panel during code review
4. Word/phrase duplication appears consistently in thought output

Uploaded thread for investigation: 019a4400-eb1a-7e20-938a-1bb8d4deb80e

What is the expected behavior?

Thoughts should display grammatically correct, non-duplicated text like:

• "Reviewing code differences"
• "Requesting differences for review"
• "Checking for other file differences"

Additional information

• This appears to be a recent regression (started a few days ago)
• Specific to the /review command workflow
• Affects all review sessions, not intermittent
• Restarting does not resolve the issue
• No error messages or console warnings observed