Problem description
The backtick character combines with other letters, with up to 2 backtics being merged together.
e.g. a` b``

Expected behavior
Backticks do not make a ligature with letters, or at least not for mono font

Screenshots
One, two and three backtics displayed alone and with letters respectively

Environment (please complete the following information):

• OS: Linux
• Browser: Firefox 87, Chromium 89.0.4389.90, VSCode 1.54.3
• Fonts: 1.077