When commenting multiple lines with the hotkey ctrl-/, if the last line of the commented text is longer than the previous line, some of the text gets duplicated and put after the comment. Screenshots with some example text that can reproduce the behavior below.
before commenting:
after commenting:
Obsidian version 1.0.0 on Windows 10, community plugins disabled.
The cursor does need to be on the empty line after the text in order for the bug to occur. If it’s at the end of the line instead, everything works well