Suppose you take the following file, except that the line containing foo also contains U+2028 somewhere in it.

# A
- foo

# B
- bar

vscode will render U+2028 as a question mark in a diamond, and the list of symbols that appear in the 'Go to Symbol in File...' popup will be shifted (by the number of U+2028 characters present in the file). Screenshots that illustrate this are below.

(Why did this come up? If you triple-click '
felicita - hej!
' in this link, and paste it into vscode, it actually has a pair of enclosing U+2028 characters. It seems unique to that page...)