Conditional rendering allows us to hide and show. We have to use 1. aura:if For showing contents when the condition is true. 2. aura:set For showing contents when the condition ....
This is a know issue. Check the below link https://developer.salesforce.com/forums/?id=906F0000000AvH7IAK Raise a Salesforce.com support ticket to know more.
Salesforce Lightning Aura Component makes use of aura:if and aura:set for expressions to hide and show the content. Please check the following code for reference. Sample Code: <aura:component > <aura:attribute ....