We have updated our magento 2 installation from 2.1.2 to 2.1.5. Everything went fine, except for the layout.
Somehow Magento doesn't load some parts of our custom theme anymore? For example the file: app/design/frontend/Wantsandneeds/theme/Magento_Theme/layout/default_head_blocks.xml
Is not triggered anymore? It worked well in 2.1.2 What has changed regarding to themes?