I don't see any fields marked as required. https://schema.org/JobPosting

But improving the plugins is of course appreciated

Well Google disagrees with you

https://search.google.com/test/rich-results/result/r%2Frecipes?id=O-tc1VQwwIBxp8lywxuMBw

google disagree with me that the plugin could be improved? or that goolge has it's on interpretation of schema.org because it needs information so it can create rich snipped based on schema.org data which is unrelated to google services?

I really don't know what you want from me. if something is wrong and you can fix it please do it. thanks

whoever said I wanted something from you

since I'm responsible for the 5.0 release and it's tagged for 5.0 and it's a feature I merged I and you talk to me in all comments I would expect you still talk to me, doesn't mean I'm the only one who can response of course.

Google does it's own thing that mostly overlaps with schema.org

https://developers.google.com/search/docs/appearance/structured-data/job-posting#structured-data-type-definitions for example for job postings here google tells you what is required and what is recommended

This is a bug not a feature