emptyStateHeading and emptyStateDescription not working in RelationManager tables

Good evening, I'm trying to change the heading and description on a relation manager empty table and using these function does not work. Is it supposed to or a bug? If it is, how could i change these without the functions?
Thanks you in advance
Solution
it was supposed to work if you are using this to the relation manager class

return $table
    ->emptyStateHeading('xxx')
    ->emptyStateDescription('yyy')
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