[macOS] ChatGPT composer text/background rendering appears vertically flipped

<img width="722" height="500" alt="Image" src="https://github.com/user-attachments/assets/47c09caf-3cb9-4db8-bfe6-b57ce53c6045" />

Summary

In the ChatGPT for macOS composer, the Chinese placeholder/helper text is rendered with an apparent vertically reflected duplicate/underlay. The reflected glyphs appear immediately above the normal text, making the input area look visually corrupted.

Environment

• ChatGPT for macOS: 26.810.41047 (build 6570)
• macOS: 26.5.2
• Architecture: arm64

Steps to reproduce

1. Open ChatGPT for macOS.
2. Open a new or existing ChatGPT conversation.
3. Focus the composer at the bottom of the window.
4. Observe the Chinese text rendered near the top-left of the composer.

Expected behavior

Composer text should render once, upright, and without a reflected or inverted ghost layer.

Actual behavior

The composer shows what appears to be a vertically flipped/reflected copy of the text above the normal characters.

Evidence

A screenshot was captured at the time of the report. It shows the affected composer text; the relevant section is the bottom-left of the input field.

Notes

• This report intentionally does not claim persistence across restarts or a specific trigger beyond the captured state.
• I can provide the original screenshot or additional reproduction details if needed.