CTRL-SHIFT-E no longer splits in v3 (Linux)

• 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: Linux Mint 19.1 Tessa
• Hyper.app version: 3.0.2 (installed via .deb)
• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/johanforssell/3dc795118fa69a03b058b740a5f173c7 (this is the default file - I removed my file before filing this issue)
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere): Nothing in the console log.
• The issue is reproducible in vanilla Hyper.app: Is Vanilla

Issue

• After upgrading to 3.0.0 and 3.0.2 I can no longer Split Horizontally. Ctrl-Shift-E will just put a number of e and E characters into my terminal.
• I have this same issue on two separate Linux machines (both Linux Mint 19.1).
• Ctrl-Shift-D still works just fine.
• Issue with both Swedish and English (UK) keyboard layout.

Start by reproducing the Ctrl-Shift-E shortcut on Linux Mint with Hyper 3.0.2 using a vanilla configuration, comparing it with Ctrl-Shift-D and the reported English (UK) and Swedish layouts. Done means Ctrl-Shift-E splits horizontally instead of inserting e or E characters, without breaking the working shortcut.