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In version 4.9.6. WordPress added certain privacy “features” to core. These include a Privacy Policy page, and an opt-in check box in the comments field. 4.9.8. removed the comment field, but also removed comment cookies from not logged in users, causing some sites to break. Useful for testing, IoT, sites in Nevada USA, or for other sites that do not need GDPR related features.
Usage
Once activated, navigate to Settings >> Privacy. New controls have been added.
Screenshots
Go to the Privacy tab
The comment form worked fine in 4.9.5
Forced the check box in 4.9.6
It vanished again in 4.9.8
Comment cookies acting weird in 4.9.8