Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
It started occurring about 4–5 days ago.
When I edit a file containing Korean characters that is encoded in EUC-KR through the Agent, it is immediately converted to UTF-8.
All Korean text in the code becomes garbled, and even if I perform an Undo on the edit result, the encoding is not restored.
This happens regardless of the AI model being used, and it occurs consistently in all cases.
After that, Even if [Undo File], the encoding does not revert to the original.
Even if select [Undo File], the file has already been saved in UTF-8, so when reopened, it appears corrupted.
Even if [Reopen with Encoding], it still appears corrupted.
- All MCP features from the cursor have been disabled at the cursor position.
- It is in Agent mode.
- The same occurs regardless of which model selected.
- I’ve seen a few similar inquiries, but the solutions provided in those posts do not resolve the issue.
Attached Images are
#1. Before Using Agent
#2. After Using Agent
#3. After Using Agent and Undo File
#4. After Using Agent and Reopen with Encoding
Steps to Reproduce
Opening a file encoded in EUC-KR
Ask to Agent : change “Sweden” to “France”
Expected Behavior
- The file encoding must not be changed.
- Korean characters must not become corrupted.
Screenshots / Screen Recordings
Operating System
MacOS
Current Cursor Version (Menu → About Cursor → Copy)
+I updated the cursor a little while ago, and the same error keeps appearing. (2026-01-22, 5 PM KST)
Version: 2.4.20
VSCode Version: 1.105.1
Commit: 20b56586b0785b8843487045393c57c6d89b7100
Date: 2026-01-22T07:38:04.757Z
Build Type: Stable
Release Track: Early Access
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0
For AI issues: which model did you use?
Composer, GPT 5.2 Sonnet 4.5
For AI issues: add Request ID with privacy disabled
Request ID : 8617561c-a96f-42b9-9fd4-5004aea51d8d
Does this stop you from using Cursor
Yes - Cursor is unusable