Copying Cyrillic text copies Unicode escape sequences (\uXXXX) instead of UTF-8 on Wayland

Description

Copying Cyrillic text to the clipboard produces Unicode escape sequences (\uXXXX) instead of UTF-8 (Ubuntu 24.04 Wayland in UTM)

Description

I'm running OpenCode inside an Ubuntu 24.04 ARM64 virtual machine using UTM on macOS (Apple Silicon M1).

When I select and copy Cyrillic (Russian) text from the OpenCode TUI, the clipboard contains JSON-style Unicode escape sequences instead of normal UTF-8 text.

The issue occurs before the text leaves Ubuntu. I verified this using wl-paste, which already returns escaped Unicode sequences.

This makes it impossible to correctly paste Russian text into macOS applications such as ChatGPT, web browsers, text editors, and other applications.

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Environment

• OpenCode: 1.18.4
• Guest OS: Ubuntu 24.04 ARM64
• Display Server: Wayland
• Virtualization: UTM
• Host OS: macOS
• Hardware: MacBook Air M1 (Apple Silicon)

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Steps to Reproduce

1. Launch OpenCode.
2. Generate some Cyrillic text, for example:

Привет мир

3. Select the text with the mouse.
4. Copy it.
5. Verify the clipboard contents:

wl-paste

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Expected Behavior

Привет мир

---

Actual Behavior

\u041f\u0440\u0438\u0432\u0435\u0442 \u043c\u0438\u0440

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Clipboard MIME Types

Running:

wl-paste --list-types

returns:

text/plain
TEXT
STRING
text/plain;charset=utf-8
UTF8_STRING
MULTIPLE
TARGETS
TIMESTAMP

The clipboard correctly advertises UTF-8 (text/plain;charset=utf-8), but the actual clipboard content already contains escaped Unicode sequences instead of plain UTF-8 text.

---

Verification

OpenCode version:

$ opencode --version
1.18.4

Clipboard content:

$ wl-paste
\u041f\u0440\u0438\u0432\u0435\u0442 \u043c\u0438\u0440

Clipboard MIME types:

$ wl-paste --list-types

text/plain
TEXT
STRING
text/plain;charset=utf-8
UTF8_STRING
MULTIPLE
TARGETS
TIMESTAMP

---

Additional Information

I confirmed that the issue occurs before the clipboard content reaches macOS.

Running:

wl-paste

already returns escaped Unicode sequences instead of UTF-8 text.

This suggests that OpenCode is writing escaped Unicode into the clipboard rather than normal UTF-8 text.

I have only reproduced this issue inside Ubuntu running in UTM on macOS. I have not yet tested whether the same behavior occurs on native Linux installations.

---

Notes

This issue appears to affect clipboard serialization of Unicode/Cyrillic characters.

ASCII text copies correctly.

Only non-ASCII (tested with Russian/Cyrillic) text is written into the clipboard as JSON-style Unicode escape sequences (\uXXXX) instead of UTF-8 text.

If additional debugging information or testing is needed, I'd be happy to help.

Plugins

No response

OpenCode version

1.18.4

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response