Fluent Hibernate Mappings broken after Upgrade from Oracle 11 to 12 c

Clash Royale CLAN TAG#URR8PPPFluent Hibernate Mappings broken after Upgrade from Oracle 11 to 12 c
I have the following mapping file:
public Fabrication_TemplatesMap()
{
{
LazyLoad();
Table("Fabrication_Templates");
Id(x => x.Fab_Tmpl_Id).GeneratedBy.Sequence("S_FAB_TMPL_ID");
Map(x => x.Fab_Tmpl_Guid);
Map(x => x.Status_Id);
Map(x => x.Fab_Tmpl_xml, "FAB_TMPL_XML");
References(f => f.fabricationrecord, "FAB_TMPL_ID").Cascade.None().Not.LazyLoad().ForeignKey("FAB_TMPL_ID").ReadOnly();
References(x => x._Status, "STATUS_ID").Cascade.None().Not.LazyLoad().ForeignKey("STATUS_ID").ReadOnly();
}
}
After the DBA updated the server to Oracle 12 c from 11 something,
the mapping stopped completely working.
It fills in Fab_Tmpl_Id and Fab_Tmpl_Guid, but everything else is null now.
I am at a loss.
Also before I had
"fab_tmpl_id" and "FAB_TMPL_ID" in a reference line and all worked
now both have to be uppercase strings to work.
Any ideas?
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