Message delivery receipt is not updated

// Detailed description of issue.
Message delivery receipt is not updated for user 1 when all the messages are delivered for user 2.

// If problem, please fill out the below. If question, please delete.
[SDK Version]
// What version of the SDK are you using?
3.17.0 UIKit

[Reproduction Steps]
// Please provide reproduction steps and, if possible, code snippets.
Send messages from user 1 to user 2.
User 2 no connects to the sdk and all the messages are received for user 2.
User 1 - delivery receipts are not updated to double tick.
It updates only when any new message is sent or received for user 1.