Worlds not saving when unloaded

[fierceeo]

Describe the issue
Worlds are not saving when unloaded. If you use the method Bukkit.unloadWorld(world, true) where "world" is the world name, it unloads the world but doesn't save it, and when you run the command /swm unload world it doesn't save the world either.

The worlds.yml file for this world looks like this

e54bb1e5-ee8d-44a5-8ebd-a44daf8c8dbd:
    source: file
    spawn: 0, 64, 0
    difficulty: peaceful
    allowMonsters: true
    allowAnimals: true
    pvp: true
    environment: NORMAL
    worldType: DEFAULT
    loadOnStartup: false
    readOnly: false

Note: I have tested this issue on multiple worlds, some other worlds are:

test:
    source: file
    spawn: 0, 64, 0
    difficulty: peaceful
    allowMonsters: true
    allowAnimals: true
    pvp: true
    environment: NORMAL
    worldType: DEFAULT
    loadOnStartup: true
    readOnly: false

Spigot version
Tuinity 1.16.2 git-Tuinity-0b86de3
Plugin version
v2.3.0-SNAPSHOT
How to reproduce
do /swm create test file, /swm goto test, place some blocks in the test world, /swm unload test, /swm load test, /swm goto test. You will then see the blocks are missing.
Crash reports (if available)
N/A

[fierceeo]

For some reason, when I restart the server, the world saves.