Right-click menu changed on Mac after editing any file

Applications
1

After edit any file in the comparison tab, right-click context menu changed to items “undo” and “redo”. It missed the original right-click context menu, which makes it impossible to access the “Add synchronization point” item. The solution may be

  1. Do not change the right-click context menu even the files are editing;
  2. Add a keyboard shortcut for “Add synchronization point” or a menu entry for it.

I am using Meld version 3.23.3 (105) on Mac Tahoe 26.1.
Thanks.