Cheats can be enabled when a world if opened on LAN, even if they were disabled on world generation. That should not be possible, as it makes the setting useless.
Related issues
Comments
Bachsau
MC-90821
Cheats should not be allowed on LAN if they are disabled for the world
Resolved
Duplicate
0
Bachsau
Bachsau
(Unassigned)
Unconfirmed
Minecraft 1.8.8
Retrieved
May I suggest adding a bug type of "Feature Request" to the tracker, so they can be easily distinguished from bugs and do not need to be closed?