Core/Spawns: prevent spawn groups from bypassing spawnMask restrictions (#26711)

* spawn groups have been able to spawn for all difficulties even when they should be restricted to a single difficulty only

(cherry picked from commit 48f63eda9029d4fe16b7a350059c8e26ba8484ce)

1 files changed, 4 insertions, 0 deletions

diff --git a/src/server/game/Maps/Map.cpp b/src/server/game/Maps/Map.cpp
index de95c08b4ac..dcf634ae3a7 100644
--- a/src/server/game/Maps/Map.cpp
+++ b/src/server/game/Maps/Map.cpp
@@ -3543,6 +3543,10 @@ bool Map::SpawnGroupSpawn(uint32 groupId, bool ignoreRespawn, bool force, std::v
 
     for (SpawnData const* data : toSpawn)
     {
+        // don't spawn if the current map difficulty is not used by the spawn
+        if (std::find(data->spawnDifficulties.begin(), data->spawnDifficulties.end(), GetDifficultyID()) == data->spawnDifficulties.end())
+            continue;
+
         // don't spawn if the grid isn't loaded (will be handled in grid loader)
         if (!IsGridLoaded(data->spawnPoint))
             continue;