I've found that after updating to 1.16.1, monsters are no longer spawning in any of my worlds. When I change it back with the /mv modify set command, it reverts back on a server restart. The Multiverse Setting is always true, but the Bukkit Setting gets reset with every restart.
[15:45:16 INFO]: --- Monster Settings ---
[15:45:16 INFO]: Multiverse Setting: true
[15:45:16 INFO]: Bukkit Setting: false
[15:45:16 INFO]: Monsters that CAN spawn: ALL
I've found that after updating to 1.16.1, monsters are no longer spawning in any of my worlds. When I change it back with the /mv modify set command, it reverts back on a server restart. The Multiverse Setting is always true, but the Bukkit Setting gets reset with every restart.