Custom features for addons such as features, feature rules, structures, and many other things that affect world generation stop working after exiting and re entering a world with an addon that has these features. If you want to recreate please use an addon with features, feature rules, or structures and then once one of your structures have generated please exit your world and re join it. Once you re join no more custom structures will spawn.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Is this still an issue in the latest version? If so, can you add it to the affected versions?