Terminal: text has shadow when displaying chinese characters

[kyze8439690]

Arbor Version

20260316.01

Operating System

macOS 15 (Sequoia)

OS Version Details

macOS 26.4 (25E246)

Architecture

Apple Silicon (M1/M2/M3/M4)

Installation Method

Homebrew Cask

Description

Steps to Reproduce

1. Open opencode tui
2. display chinese character in terminal

Expected Behavior

Chinese rendered like english character.
Btw, in ghostty everything works as expected.

Actual Behavior

Chinese rendered with unexpected shadow block.

Logs / Screenshots

No response