Other frontmatter parameter error while editing in Expert mode

[reachcontent]

Don't know if this is linked to the previous issue (#9) but it reminded me of it. This occurred specifically while trying to edit in Expert mode the "Page not found template": attempt to save triggered an error with this message.

Validation failed: Invalid input in "Robots""

The incriminated bit in Frontmatter:

title: Page not Found robots: noindex,nofollow body_classes: "modular header-lite fullwidth error" template: error routable: false http_response_code: 404

The point is that editing in Normal mode works ok, and seems to then generate this updated Frontmatter:

title: 'Page not Found' process:

markdown: true
twig: true

robots:

noindex: false
nofollow: false

routable: false child_type: default body_classes: 'modular header-lite fullwidth error' template: error http_response_code: 404

[hexplor]

Yeah, probably robots variable changed with syntax as well.