Menu is lost in subthemes

Works after installation but when I do a very simple subtheme the Main Navigation Menu is lost. A different menu appears but it doesn't work well, as attached picture shows.

The subtheme is (themes/reiniciar_openchurch/reiniciar_openchurch.info.yml):

name: reiniciar_openchurch
type: theme
description: Subtema de OpenChurch
core: 8.x
# Defines the base theme
base theme: openchurch_theme
# Defines libraries group in which we can add css/js.
libraries:
  - reiniciar_openchurch/global-styling
# Regions
regions:
  header: Encabezado
  primary_menu: 'Menú Principal'
  secondary_menu: 'Menú Secundario'
  help: Help
  page_top: 'Page top'
  page_bottom: 'Page bottom'
  highlighted: Highlighted
  breadcrumb: Breadcrumb
  content: Content
  sidebar_first: 'Sidebar first'
  sidebar_second: 'Sidebar second'
  triptych_first: 'Triptych first'
  triptych_middle: 'Triptych middle'
  triptych_last: 'Triptych last'
  footer_first: 'Footer first'
  footer_second: 'Footer second'
  footer_third: 'Footer third'
  footer_fourth: 'Footer fourth'
  footer_fifth: 'Footer fifth'
  footer: 'Footer'

and themes/reiniciar_openchurch/reiniciar_openchurch.libraries.yml is:

global-styling:
  css:
    theme:
      css/style.css: {}