[Bug] Korean input causes line merge on second character in macOS 15.5 (Obsidian 1.8.10)

Bug reports
1

Platform: macOS 15.5 (24F74)
Obsidian Version: 1.8.10
Issue:

When switching from English to Korean input while typing in Obsidian, an unexpected line merging issue occurs.

Steps to Reproduce:

  1. Type a line in English.
  2. Switch the input method to Korean (2-set layout).
  3. Type one complete Korean character (consonant + vowel).
  4. Then type the next consonant (e.g., start composing the second character).

At this point, the next line (the one below the cursor) is merged up into the current line, as if the Delete key was pressed.

Expected Behavior:

The next line should remain untouched. The cursor should simply move forward within the current line.

Environment Notes:

  • Happens in both Source Mode and Live Preview.
  • Happens even in Safe Mode (no plugins).
  • Happens with both default theme and after full config reset.
  • Occurs regardless of whether Gureum IME or the default Apple Korean IME is used.
  • Other editors (VS Code) work perfectly fine with the same input method.

Impact:

This makes writing in Korean extremely difficult and disruptive, especially in longer documents.

Please investigate this bug—it’s likely affecting more Korean users than currently reported.