[BUG] Thai characters display as squares (tofu) in Claude Code CLI - works fine outside Claude

Found 3 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/18103
2. https://github.com/anthropics/claude-code/issues/18281
3. https://github.com/anthropics/claude-code/issues/9907

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🤖 Generated with Claude Code

<img width="454" height="162" alt="Image" src="https://github.com/user-attachments/assets/a27edeb4-6be6-4c71-b9a4-4f13574f296e" />

This issue is related but not a duplicate of the suggested issues:

• #18103 - Chinese characters (different language, same root cause)
• #18281 - Kannada characters (different language, same root cause)
• #9907 - Nerd Font icons (different issue - icon fonts, not language characters)

This issue specifically reports Thai language characters displaying as squares (tofu). While the root cause is likely the same TUI Unicode rendering problem, having separate issues for different languages helps:

1. Track which languages are affected
2. Verify fixes work across all affected scripts
3. Allow affected users from different regions to subscribe and provide feedback

Please keep this issue open as a reference for Thai language support in Claude Code's TUI rendering.

<img width="775" height="230" alt="Image" src="https://github.com/user-attachments/assets/84d1aadd-af5f-42c8-8e2b-e32bad7a2e1a" />

Me too

I face the same issue

<img width="526" height="116" alt="Image" src="https://github.com/user-attachments/assets/c7abf1e6-f06a-43ff-afaa-6c2d013c2808" />

+1

+1 same issue

+1 same issue

<img width="560" height="104" alt="Image" src="https://github.com/user-attachments/assets/3554689e-f76a-4614-b1ce-9b0e51ad232f" />

mac

Additional finding from Thai user:

The issue is more specific than font rendering - Thai vowel อา (U+0E32) is being filtered/stripped out rather than just displaying as tofu.

Example:

• Expected: ภาษา (5 characters: ภ า ษ า)
• Actual display: ภษ (2 characters - both อา vowels missing)

This suggests the TUI is stripping certain Unicode characters, not just failing to render them.

Other Thai characters that may be affected:

• สระอา (า) U+0E32
• Possibly other Thai vowels and tone marks

This is different from the "tofu squares" issue - the characters are completely invisible/removed.

Screenshot evidence of Thai vowel อา (U+0E32) being stripped:

\![Thai vowel stripped](https://github.com/user-attachments/assets/{"errors":[{"message":"Expected VALUE, actual: UNKNOWN_CHAR (\"\\\\\") at [1, 50]","locations":[{"line":1,"column":50}]}]}upload-failed

The screenshot shows:
| Displayed | Expected |
|-----------|----------|
| ปัญหสระ อหย | ปัญหาสระอาหาย |
| จัดกร | จัดการ |
| ถ้ไม่ | ถ้าไม่ |
| ปัญหอื่น | ปัญหาอื่น |

Every instance of Thai vowel อา (U+0E32) is completely removed from the output.

<img width="1035" height="498" alt="Image" src="https://github.com/user-attachments/assets/9fc47942-ca7f-4030-bd21-25bd95d41253" />

not limited to Thai. This happening on english (usa) language, and has been for ~4-5+ weeks

This has been fixed in the latest release. Thai spacing vowels (U+0E32 SARA AA, U+0E33 SARA AM) were incorrectly classified as zero-width combining marks in the TUI rendering pipeline, causing them to be silently dropped from the screen buffer. The fix corrects the width classification so these characters are properly treated as width-1 spacing vowels and render correctly.

Please update to the latest version and confirm the fix. Closing this issue.

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.