Render field by name in custom content node template
Ended up installing a fresh copy of Drupal and re-adding the content type (through the UI as before). After that it worked fine.

Not sure why that happened, no time to debug, will just continue with this install.

I suspect either I broke the the 'Frontpage' view while fiddling, or one of the Modules was breaking it, perhaps Twig Field Value.

I need to now access a multi value field in Twig, thinking something like {{ content.field_name.0 }}. I need to access the array directly without the use of a foreach loop, because they fit into different parts of the html layout.

Thanks for the responses!