[MessageCollection] Chat SDK v4 migration problem

After I upgrade sdk from v3 to v4, some messages are disappeared.

@sendbird/chat”: “4.0.0-beta.4”

const messageCollection: MessageCollection = ...
collection
      .initialize(MessageCollectionInitPolicy.CACHE_AND_REPLACE_BY_API)
      .onApiResult((e, messages) => {
           // v3 messages count = 9
           // v4 messages count = 0
      })
      ....

---------------------------------------
const channel: GroupChannel = ...
const messages = await channel.getMessagesByTimestamp(...);
console.log(messages.length);
// v3 messages count = 9
// v4 messages count = 9