alt-shift-up alt-shift-down multi caret / cursor not working

[progonkpa]

alt-shift-up alt-shift-down multi cursor has worked in the past but doesn't atm.
I don't know what could have caused it.

In keymappings I see these keybindings are bound to 'native!'.
I don't know how to override 'native!' with this plugin.
Also, I think overriding shouldn't be necessary in normal scenarios as it has worked in the past.

I tried this keymaps.cson but it didn't change the behaviour.

'atom-text-editor':
'alt-shift-down': 'Intellij Idea Keymap'
'alt-shift-up': 'Intellij Idea Keymap'