WorldCreator#keepSpawnLoaded

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -1328,7 +1328,7 @@ public final class CraftServer implements Server {
         }
 
         // If set to not keep spawn in memory (changed from default) then adjust rule accordingly
-        if (!creator.keepSpawnInMemory()) {
+        if (creator.keepSpawnLoaded() == net.kyori.adventure.util.TriState.FALSE) { // Paper
             worlddata.getGameRules().getRule(GameRules.RULE_SPAWN_CHUNK_RADIUS).set(0, null);
         }
         ServerLevel internal = (ServerLevel) new ServerLevel(this.console, this.console.executor, worldSession, worlddata, worldKey, worlddimension, this.getServer().progressListenerFactory.create(worlddata.getGameRules().getInt(GameRules.RULE_SPAWN_CHUNK_RADIUS)),