diaglist.nvim does not populate :copen only after open_all_diagnostics

[balazser]

Hi @onsails,
Thank you for your plugin. I use it with the sample config:

lua require("diaglist").init({
    debug = false, 
    debounce_ms = 150,
})

I noticed the quickfix only populated after I call lua require('diaglist').open_all_diagnostics() which sets the window title and in this way lets the vim.fn.getqflist{ title = 0 }.title ~= check to pass.
So currently, I always get the print('foreign quickfix, not populating') message for using :copen.
I'm wondering why does it work like this? Should the README point it out?