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Google updated the content guidelines to expand out this guideline: 'All FAQ content must be visible to the user on the source page,' by providing examples of valid and invalid use cases.
There has been a lot of flux recently in the SERPs for FAQ rich results, and this possibly provides some explanation why.
The valid use cases listed are:
The invalid use case listed is:
Originally noticed by industry members that FAQ rich results had decreased dramatically, this was not changed on the official documentation, however it was confirmed by Google spokesperson Danny Sullivan that the results are now limited to a maximum of two.