When creating a world, 'Do Daylight Cycle' and 'Always Day' can both be disabled. This is intentional, but when 'Always Day' is clicked at least once, they can no longer both be disabled.
To Reproduce:
Start creating a new world and enable cheats.
Disable 'Do Daylight Cycle'. Notice that 'Always Day' is unaffected.
Enable 'Do Daylight Cycle'. Notice that 'Always Day' is unaffected.
Enable 'Always Day'. Notice that 'Do Daylight Cycle' is disabled as a result.
Disable 'Always Day'. Notice that 'Do Daylight Cycle' is enabled as a result. Also notice that the two settings are at their default values now.
Disable 'Do Daylight Cycle'. Notice that unlike in step 1, 'Always Day' is enabled as a result.
Comments 2
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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This can also be seen in a more simple way.
When creating a world, enabling 'Always Day' disabled 'Do Daylight Cycle' (which it should), but then disabling 'Always Day' after doing that also enables 'Do Daylight Cycle' (which it shouldn't).