In vi-mode, the second input key will be eaten by the vi-mode.

[sakurawald]

Given this typical configuration for vi-mode:

(define-key lem-vi-mode:*insert-keymap* "j k" 'lem-vi-mode/commands:vi-normal)

Try to input (create-object), you will get (create-objct) as result.
This is due to the character e is eaten by vi-mode.

In a real vim editor, if you define this key-sequence, and try to type j k.

1. After you type in the j key, the vim will wait a timeout, and if there is no folloing keys, then the j is inserted.
2. If you type in j and k as quickly as you can, then after the k is inputed, it will stop the waiting of next-key, and causing the character j and character k get inserted. (If there is no ambiguous key bindings).

[sakurawald]

Similar issue is here: #1606
This is a problem related to the difference between vi-mode and the real vim editor.