[SalesForce] sObjectName and lightning quick action

I have a lightning quick action that needs to check the sObjectName to trigger a conditional action that will fill some fields depending on it.

The problem that I encounter is that when using the implements for the lightning quick action and the hasSObjectName the value is empty but I can get the recordId using the same method and there's no error.

<aura:component description="ClonePricebook"
                implements="flexipage:availableForAllPageTypes,
                flexipage:availableForRecordHome,
                force:lightningQuickAction,
                force:hasRecordId,
                force:hasSObjectName"
                access="global">
<p>{!v.recordId}</p> //Filled
<p>{!v.sObjectName}</p> // Empty
</aura:component>

According to the release notes of Summer 17 (https://releasenotes.docs.salesforce.com/en-us/summer17/release-notes/rn_lightning_force_hassobjectname.htm) I should be able to use it inside a quick action.

Why can't I get the sObjectName in this case ?