Crumbs not adding home link to beginning
How to find out why not seeing the home link in bredcrums Drupal 8.


Check your theme (admin/appearance/settings/THEMENAME)

Some themes like bootstrap can set to show or not.
Check modules for any 'hook_system_breadcrumb_alter'

These can alter how bredcrums work. 
Check modules for any services tagged with - "{ name: breadcrumb_builder" (same as above)
Check theme templates for any templates overriding core bredcrums or .theme overrides
Check if the block is enabled (admin/structure/block)
Cry