Instarepl doesn't use my existing connection

[MasterMastic]

This is a crosspost of this issue, please see the comments there. The OP:

I'm trying to use instarepl with my project but instead of using my project, it always creates its own connection.

Steps to reproduce:

Load a project folder and open a source file in the editor.
Connect to it with Ctrl+Enter.
Wait for connection to be completed.
Ctrl+Space, select Instarepl: Open a clojure instarepl
Wait, it's making a new connection again (undesired).
Try to evaluate (require 'my-project.core) anyway, which fails with java.io.FileNotFoundException: Could not locate myproject/core__init.class or myproject/core.clj on classpath.
Go to View -> Connections, see one connection for my project and another one called "LightTable-REPL" of type lein-light-nrepl.
I'm running Light Table 0.8.1 on Arch Linux x86_64.