The register_rest_route but is still here. Not completed. It is showing up in all my environments, servers, themes.

Function register_rest_route was called <strong>incorrectly</strong>. REST API routes must be registered on the <code>rest_api_init</code> action. Instead route '<code>/filesystem/enable</code>' with namespace '<code>snipvault/v1</code>' was not registered on this action. Please see <a href="https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/">Debugging in WordPress</a> for more information. (This message was added in version 5.1.0.)