I had my world and was so excited to see that I can set that only one person needs to sleep to pass the night, which means I can do this without disabling achievements. However, I wanted to be able to let my family play even when I am not online, so I paid for a realm and uploaded my world to it, and now there is no option to set how many people need to sleep.

To reproduce:
Create a world on a realm.
Go to settings, and look for the "Players Needed to Pass the Night" setting.

Expected result:
Setting is there and can be used to set a custom % of people who need to sleep in order to pass the night.

Actual result:
This setting is gone for realms, whereas it is there for non-realm worlds.