You mean after leaving a legacy and starting a new run, it just isn't given to you? It needs to be the same play session or it is forgotten (ie. can't refresh the page between). I guess there is no reason to add a custom game mode if such is wanted.
The legacies are given to me (like I'll see I'm starting with additional lives or given the ability to pass on rewards) but the symbol doesn't appear with my other rewards.