bug with sitemap output

[momon]

I am guessing this is a bug as it doesn't make sense it would be intentional, but when you use the sitemap shortcode:

[[!SeoSuiteSitemap? &contexts=`web,es` &allowSymlinks=`0`]]

I was getting a duplicate english entry as alternate links. I was expecting one of them to be x-default. So digging into the code I found that [[+locale]] actually contains x-default declaration for the default context which would fix the error. However, by default the chunk on alternate links is using

hreflang="[[+cultureKey]]"

So I worked around it by creating my own chunk and adding a bit of logic in it like so:

<xhtml:link rel="alternate" hreflang="[[+locale:is=`x-default`:then=`x-default`:else=`[[+cultureKey]]`]]" href="[[+url]]"/>

This gives me the intended output but I figure I would post it here in case someone comes across a similar issue.

Again I am not sure if that is intentional or not as we have a highly customized website and thus it might be something specific to our environment.