Hyper not using fonts correctly

• I am on the latest Hyper.app version
• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: Windows 10 Build 19042.867, version 20H2, Ubuntu WSL 20.04 LTS
• Hyper.app version: 3.0.2
• Link of a Gist with the contents of your .hyper.js: Gist
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere): Not sure what is applicable
• The issue is reproducible in vanilla Hyper.app: Tested in vanilla, same issue.

Issue

I'm unsure why, but hyper is not loading fonts correctly. I have the font "Inconsolata for Powerline" installed in windows (verified using the fonts section of control panel) and set in my .hyper.js but the font isn't loading correctly, as you can see in the screenshot of tmux.

I have also tested it with the font "Deja Vu Sans Mono for Powerline" with the same issue
Any help would be appreciated

Start by reproducing the report on Windows 10 with Ubuntu WSL, Hyper.app 3.0.2, the linked .hyper.js configuration, and both listed Powerline fonts. Compare vanilla Hyper with the configured font; done means the selected installed font renders correctly in the terminal and tmux.