VIM Cannot autocomplete using return key, when there is one completion possibility

I have autocomplpop plugin installed, but it shouldn’t change much. So normally when I toggle autocompletion and there are multiple choices, I navigate by arrows and press enter to complete. But when there is only one possible choice it doesn’t work.

If I press ctrl + n it will autocomplete, but in order to show again i need to add one character and delete it, and press ctrl + n again, or else it will delete previous completion.

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I want to be able to complete one instance with return key.