diff --git a/server-rs/crates/api-server/src/game_play_counter.rs b/server-rs/crates/api-server/src/game_play_counter.rs
index d8fb7c598..56a138607 100644
--- a/server-rs/crates/api-server/src/game_play_counter.rs
+++ b/server-rs/crates/api-server/src/game_play_counter.rs
@@ -81,10 +81,10 @@ pub struct GamePlayCounter {
 struct GamePlayCounterState {
     /// `game_id -> 待落库增量`；只包含通过校验的上报，键空间由公开游戏目录界定。
     pending: HashMap<String, u64>,
-    /// `identity + game_id -> 最近一次计数时间`。
-    seen: HashMap<String, Instant>,
-    /// `IP + game_id -> 当前固定窗口`。
-    rate: HashMap<String, RateWindow>,
+    /// `(identity, game_id) -> 最近一次计数时间`。
+    seen: HashMap<(String, String), Instant>,
+    /// `(IP, game_id) -> 当前固定窗口`。
+    rate: HashMap<(String, String), RateWindow>,
     /// 最近一次真正取走增量的时间，用于判断是否到达 flush 间隔。
     last_flush_at: Instant,
 }
@@ -115,8 +115,10 @@ impl GamePlayCounter {
     ///
     /// 被去重命中的上报不消耗限流额度；限流只挡同一 IP 对同一游戏的超额上报。
     pub fn record(&self, report: GamePlayReport<'_>, now: Instant) -> GamePlayOutcome {
-        let dedup_key = format!("{}\u{1f}{}", report.identity, report.game_id);
-        let rate_key = format!("{}\u{1f}{}", report.client_ip, report.game_id);
+        // 键用元组而不是拼接字符串：clientId 来自 JSON，可能包含任意字节（含 U+001F），
+        // 拼接会产生本不存在的键碰撞。
+        let dedup_key = (report.identity.to_string(), report.game_id.to_string());
+        let rate_key = (report.client_ip.to_string(), report.game_id.to_string());
         let mut state = self.lock();
 
         if let Some(seen_at) = state.seen.get(&dedup_key)
@@ -413,4 +415,21 @@ mod tests {
             GamePlayOutcome::Counted
         );
     }
+
+    #[test]
+    fn separator_like_bytes_in_key_parts_do_not_collide() {
+        let start = Instant::now();
+        let counter = GamePlayCounter::new(settings(), start);
+
+        // 旧实现用 U+001F 拼接 identity/game_id，下面两个不同元组会被拼成同一个键。
+        assert_eq!(
+            counter.record(report("b\u{1f}c", "a", "1.1.1.1"), start),
+            GamePlayOutcome::Counted
+        );
+        assert_eq!(
+            counter.record(report("c", "a\u{1f}b", "1.1.1.1"), start),
+            GamePlayOutcome::Counted
+        );
+        assert_eq!(counter.pending_total(), 2);
+    }
 }