Custom ‘rest_url_prefix’

I change the default Rest API prefix from ‘wp-json’ to ‘api’ using this filter in a mu-plugin.

<?php
function wpr_rest_api_prefix ()
{
    return 'api';
}
add_filter( 'rest_url_prefix', 'wpr_rest_api_prefix');

And I think this plugin does not detect this. Because nothing is listed in ‘Endpoint API caches’.

If I’m right, can you add this feature, please? Thanks in advance.