[BUG] Security Account Metadata is lost

[adamretter]

If you create a new user by storing the following into /db/system/security/exist/accounts/user1.xml:

<account xmlns="http://exist-db.org/Configuration" id="15">
    <group name="nogroup"/>
    <password>{RIPEMD160}q2VXP75jMi+d8E5VAsEr6pD8V5w=</password>
    <expired>false</expired>
    <enabled>true</enabled>
    <umask>022</umask>
    <metadata key="http://axschema.org/namePerson">User 1</metadata>
    <name>user1</name>
</account>

The metadata of that account is lost.

The following query:

sm:get-account-metadata("user1",  xs:anyURI("http://axschema.org/namePerson"))

Should return the string User 1, but instead it incorrectly returns an empty sequence.