[Bug] Panic: Invalid UTF-8 byte index in string processing with multibyte characters

[lhj6102]

Bug Description
thread '' (14984) panicked at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb\library\core\src\str\mod.rs:833:21:
byte index 11 is not a char boundary; it is inside '파' (bytes 9..12) of 한계돌파", "lv1")),
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace

Environment Info

• Platform: win32
• Terminal: vscode
• Version: 2.0.76
• Feedback ID: 2e5e7de7-fc39-48b3-9119-d7603c01a0ba

Errors

[]

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] Rust panic on Korean (UTF-8) character boundary when editing markdown #16263
2. Rust panic on Korean (UTF-8 multibyte) text processing #16244
3. [BUG] Rust panic on UTF-8 char boundary when processing Korean text files #16543

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