PaperMC/paper-server/nms-patches/TileEntityRecordPlayer.patch

@@ -29,6 +29,11 @@
     }
 
     public void setRecord(ItemStack itemstack) {
+        // CraftBukkit start - There can only be one
+        if (itemstack != null) {
+            itemstack.count = 1;
+        }
+        // CraftBukkit end
         this.record = itemstack;
         this.update();
     }