If a message is sent in the chat, you can see this message in the chat only if it really has arrived on the server.
This means: The message is sent directly when you press "Send", but is still "in the process of being delivered". Only if the message is displayed in the chat itself, then the message has been received by the recipient.
This means: The message is sent directly when you press "Send", but is still "in the process of being delivered". Only if the message is displayed in the chat itself, then the message has been received by the recipient.