In case of multilingual Web Site you need to republish
_System\Publish Settings page from Master Web Site publication.
The way how it is implemented in PublishMappings .NET TBB from TRI v1.0.1 that all
mappings/includes added to the package only if you are publishing from Master Web Site publication.
filesCreated.AddRange(PublishJsonData(ReadMappingsData(), coreConfigComponent, "mapping", sg, true));
filesCreated.Add(PublishJsonData(ReadPageTemplateIncludes(), coreConfigComponent, "includes", "includes", sg));
I have been hitting my head against wall for many hours to finally understand what is going on.