The implementation of this update will no longer require users to delete their OTPs individually as Google’s Messages app will smartly work to delete those that are stored in a device. However, in the event a user actually decides to have the OTPs stored in their device for a certain period of time, there is a chance to save those messages as the system would prompt a user before deletion.
While this update is currently being reported to be a test in progress, users should also keep in mind that Google could eventually decide to eliminate this update altogether without prior notice if they see fit. That being said, it still remains to be seen if Google will indeed bring this feature in the next update for its Messages app across all Android devices. At the time of writing, the company has yet to make any announcement regarding this update as it is currently in its testing phase as mentioned earlier. However, if you are someone who does not check your device’s inbox on a daily basis, then this feature could actually be an update to look out for in the near future. (Source: Android Police, XDA)