• VSCode Version: 1.49.0
• OS Version: Windows 10

Steps to Reproduce:

1. Set editor.renderWhitespace to all.
2. Set editor.fontFamily to Source Code Pro (ensure you have the font installed on your system).
3. Set editor.fontLigatures to false (this issue is not reproducible if this setting is not set to false).
4. Open a new editor and type l l (a lowercase letter "l", followed by a space, followed by another lowercase letter "l").

Screenshot of this bug:

When editor.renderWhitespace is set to all, the whitespace character (U+0020) is rendered as the middle dot unicode character, · (U+00B7). Coincidentally, "Source Code Pro" has a ligature that comprise of the characters l·l (see the screenshot above), so this might be the reason why the ligature is invoked.

Does this issue occur when all extensions are disabled?: Yes