Under what circumstances will "the other party is typing" appear on WeChat?

In the first case, as expected by the user, the other party is entering a reply message, but it takes a long time for WeChat to inform the waiting person in this way. In other words, when one of the two chat parties is slow in typing and takes a long time to reply, WeChat will display the words "The other party is typing".

The second situation is more complicated. Although WeChat shows that "the other party is typing", it does not mean that the other party must be typing, or it may be because of network reasons that WeChat misjudges.