The old UI screen appears, when opening the world's settings option, and the new UI screen is lost. Either before starting the world, or opening settings in game, the bug works the same.
Comments 3
There is no change. The New UI might be used in settings at all times as it is more advanced than the old design.
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By "the new UI screen", do you mean the one labeled "Create New World" at the top? If so, this behavior was already present in the 1.19.41 release. Was there a change in the behavior with the 1.19.50.24 Preview? What makes you think the Create UI should be used to display the settings for an existing world?