try emitting player disconnects and immediate packet updates immediately (otherwise the server doesn't see the disconnect message and the last player remains online)

modules/events-mod/src/main/typescript/main/cache/EventDataCache.ts

@@ -1,5 +1,6 @@
 import KafkatorioSettings from "../settings/KafkatorioSettings";
 import {KafkatorioKeyedPacketData} from "../types";
+import packetEmitter from "../PacketEmitter";
 
 export namespace EventUpdates {
 
@@ -71,6 +72,10 @@ export namespace EventUpdates {
       if (expirationDurationTicks != undefined) {
         entry.expirationDurationTicks = expirationDurationTicks
       }
+
+      if (entry.expirationDurationTicks != undefined && entry.expirationDurationTicks <= 0) {
+        this.extractAndEmitExpiredPackets()
+      }
     }
 
 
@@ -90,8 +95,9 @@ export namespace EventUpdates {
     }
 
 
+    /** Removes all expired entries from the cache, and return them. */
     // use in/out v4.7.0 https://github.com/microsoft/TypeScript/pull/48240
-    public extractExpired(): Array<KafkatorioKeyedPacketData> {
+    private extractExpired(): Array<KafkatorioKeyedPacketData> {
       let countExpired = 0
       let countTotal = 0
       const expiredData: Array<KafkatorioKeyedPacketData> = []
@@ -114,6 +120,25 @@ export namespace EventUpdates {
     }
 
 
+    /**
+     * Removes and emits all expired packets.
+     *
+     * @return the number of emitted packets
+     */
+    public extractAndEmitExpiredPackets() {
+      const cachedEvents: Array<KafkatorioKeyedPacketData> = this.extractExpired()
+
+      if (cachedEvents.length > 0) {
+        log(`[EventDataCache] emitting ${cachedEvents.length} events on tick ${game.tick}`)
+        for (const event of cachedEvents) {
+          packetEmitter.emitKeyedPacket(event)
+        }
+      }
+
+      return cachedEvents.length
+    }
+
+
     private getCacheEntry<PACKET extends KafkatorioKeyedPacketData>(
         key: EventUpdates.PacketKey<PACKET>,
         type: EventUpdates.PacketType<PACKET>,

modules/events-mod/src/main/typescript/main/cache/cacheChecker.ts

@@ -1,16 +1,10 @@
 import EventCacheService from "./EventDataCache";
-import packetEmitter from "../PacketEmitter";
-import {KafkatorioKeyedPacketData} from "../types";
+
 
 /** Every 0.1 seconds */
 script.on_nth_tick(6, (nthTick: NthTickEventData) => {
-  const cachedEvents: Array<KafkatorioKeyedPacketData> = EventCacheService.extractExpired()
-
-  if (cachedEvents.length > 0) {
-    log(`nth tick ${nthTick.tick} has ${cachedEvents.length} events`)
-
-    for (const event of cachedEvents) {
-      packetEmitter.emitKeyedPacket(event)
-    }
+  const emittedCount = EventCacheService.extractAndEmitExpiredPackets()
+  if (emittedCount > 0) {
+    log(`[on_nth_tick:${nthTick.tick}] emitted ${emittedCount} events`)
   }
 })

modules/events-mod/src/main/typescript/main/events/onPlayerEventListeners.ts

@@ -1,7 +1,11 @@
 import {Converters} from "./converters";
 import EventUpdatesManager from "../cache/EventDataCache";
-import {KafkatorioPacketData} from "../../generated/kafkatorio-schema/kafkatorio-schema";
+import {
+  KafkatorioPacketData,
+  PlayerUpdateKey
+} from "../../generated/kafkatorio-schema/kafkatorio-schema";
 import Type = KafkatorioPacketData.Type;
+import packetEmitter from "../PacketEmitter";
 
 
 type PlayerUpdater = (player: LuaPlayer, data: KafkatorioPacketData.PlayerUpdate) => void
@@ -44,7 +48,7 @@ function playerUpdateThrottle(
         data.events[eventName] ??= []
         data.events[eventName].push(event.tick)
       },
-      expirationDurationTicks
+      expirationDurationTicks,
   )
 }
 
@@ -183,13 +187,26 @@ script.on_event(
     defines.events.on_pre_player_left_game,
     (event: OnPrePlayerLeftGameEvent) => {
       log(`on_pre_player_left_game ${event.tick} ${event.name}`)
-      playerUpdateImmediate(
-          event,
-          (player, data) => {
-            data.disconnectReason = disconnectReasons.get(event.reason)
-            playerOnlineInfo(player, data)
-          }
-      )
+
+      const playerUpdateKey: PlayerUpdateKey = {
+        index: event.player_index
+      }
+
+      const playerUpdate: KafkatorioPacketData.PlayerUpdate = {
+        type: KafkatorioPacketData.Type.PlayerUpdate,
+        key: playerUpdateKey,
+        disconnectReason: disconnectReasons.get(event.reason)
+      }
+
+      packetEmitter.emitKeyedPacket(playerUpdate)
+
+      // playerUpdateImmediate(
+      //     event,
+      //     (player, data) => {
+      //       data.disconnectReason = disconnectReasons.get(event.reason)
+      //       playerOnlineInfo(player, data)
+      //     }
+      // )
     }
 )