REST API error
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REST API errors usually prevent the block editor from functioning correctly.
They often stem from authentication issues, blocked endpoints, or malformed responses.
Security plugins and server firewalls frequently block REST routes. Temporarily disabling them helps isolate the cause.
Permalink misconfiguration or PHP warnings outputting before JSON responses can also break API calls.
A common oversight is ignoring REST errors because the frontend still loads.
The takeaway is that modern WordPress depends heavily on a healthy REST API.