Only re-deliver query results if results have changed

Code example probably will be best description here.

@Entity
class KAEntry(
    @Unique val key: String,
    val value: String,
    @Id var id: Long = 0
)

class MyApp : Application() { 
    private lateinit var subs1: DataSubscription
    private lateinit var subs2: DataSubscription
    private lateinit var boxStore: BoxStore
        private set
   
    override fun onCreate() {
        super.onCreate()
        boxStore = MyObjectBox.builder().name("main").androidContext(this).build()
        val box = boxStore.boxFor(KAEntry::class.java)
        box.removeAll() // just for reproducibility, to avoid "unique constraint violation" on second run of app

        subs1 = box.query().equal(KAEntry_.key, "key1")
            .build().subscribe().observer { v ->
                Log.i("MyApp", "triggered for key1" )
            }

        subs2 = box.query().equal(KAEntry_.key, "key2")
            .build().subscribe().observer { v ->
                Log.i("MyApp", "triggered for key2" )
            }

        box.put(KAEntry("key1","some value"))
    }
}

Problem is that even I've only put "key1" object and therefore only first query should trigger it's observer - both actually get triggered:

2021-04-05 14:22:53.263 25926-25962/com.acme I/MyApp: triggered for key1
2021-04-05 14:22:53.263 25926-25963/com.acme I/MyApp: triggered for key2

Either I don't understand something or this observer on query actually bugged.
I can see that triggering observer for only those objects that are changed and are in query result may have some performance impact. Though even in this case I would like to have some way of detecting that change was made to objects that query returns and not any object of this type.

未指定源文件、测试或入口点。首先复现 Kotlin 查询订阅示例，然后跟踪查询观察者的实现及其测试（如果存在）。完成的标准是：只有当观察者的查询结果发生变化时才通知观察者，或者记录文档说明受支持的检测相关对象变化的方法。