startTyping and onTypingStatusUpdated wired javascript sdk

[Problem/Question]

onTypingStatusUpdated get event with channel.isTyping === false directly after getting event channel.isTyping === true

When Device1 is getter, Device2 is sender. Device2 shot startTyping() and Device1 get event onTypingStatusUpdated (channel.isTyping === true), but Device1 get event directly(about 1 sec after) get event onTypingStatusUpdated (channel.isTyping === false).

Anyone has occurred this work?

i use sendbird/chat 4.9.8 use in react native 0.66.5

— additional —
my co-worker simulator work correctly, why this happening work???