API, create user, no longer returns user_id

Product Support
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To confirm the issue, I created a user through the API on 3.4.0.beta3-dev and it returned user_id in the response.

{
	"success": true,
	"active": true,
	"message": "Your account is activated and ready to use.",
	"user_id": 3
}

I did it again after upgrading to 3.4.0.beta4-dev and user_id is then missing:

{
	"success": true,
	"active": true,
	"message": "Your account is activated and ready to use."
}