The bug
When creating a new world, if something like the superflat preset is changed and saved, going back to the same page does not show the previous configuration, but resets to default - however, the settings are still saved and if you click "Cancel", then generate the world, the original settings are used.
How to reproduce
Start creating a world
Set the world type to superflat and change the preset (I for example used minecraft:bedrock,99*minecraft:white_concrete;minecraft:forest)
Click Done
Open up the same screen again
The settings have been reset
Linked issues
relates to 1
Comments 3
This also occurs for the different generation options I will add, such as the islands/cave/single biome which also have their own settings/resets.
Seems to have been fixed by MC-188088
I revamped the ticket to actually show what is happening, has nothing to do with the gamerules screen.