Summary
When typing a Korean word in a Confluence Table a new column is created.
Steps to Reproduce
- Open Confluence in Safari browser
- Create a Confluence Table
- Add some text to the table header
- Set input to Korean and type some text (EN: xptmxm -> KR: 테스트)
Expected Results
Word is typed into the Table cell

Actual Results
A new blank column is created when typing the word in Korean

Screenrecording
Workaround
Use an alternative browser for the time being (Chrome / Firefox)