This is a patch release for 1.3 that drops support for older versions of the game. Both releases behave the same.

To recap the changes in 1.3:

• Players in other dimensions are no longer counted toward the total number of players
• Changing player conditions will now update the playersSleepingPercentage while players are trying to sleep
  • This means a player leaving and rejoining, or travelling to the nether, will now work correctly!
• The "relative percentage" (percentage of online, non-AFK players in the same dimension) that have to sleep to pass the night can now be updated directly by changing the playersSleepingPercentage gamerule
  • I kept having to check my own documentation to remember what value had to change. This massively simplifies the experience and removes a big source of surprise.