Some nodes validate when they should not

[labra]

The following shape:

PREFIX :    <http://www.wikidata.org/entity/>

start=@<publication>

<publication> {
 :P50 @<author> +;
}

<author> EXTRA :P31 {
  :P31 @<elf> ;
  :P27 @<country_value> 
}

<elf> [ :Q174396 ] 
<country_value> [ :Q183 ]

Shouldn't validate any node because it is asking for publications made by elfs...however, it returns all authors ignoring the values.

We have reproduced with this simple test case

It seems to detect all the failing nodes but it ignores their values and asserts that the node conforms...