There have been a few complaints recently from Pixel 3 owners about SMS text messages disappearing for now apparent reason. Google has now acknowledged that this issue does affect some Pixel 3 and Pixel 3 handsets. The company is developing a fix which should be out in the near future to quash this bug for good.
The Pixel 3 has had more than its fair share of issues at launch, some of which include aggressive RAM management, the device overheating while charging, and screen flickering. The Disappearing Messages Bug was just the cherry on top, so to speak.
This bug was apparently introduced by the November security update for the device as reports about it have come from those who have installed the latest update. The issues don’t seem to be with the Android Messages app as there have been no reports about similar issues on other Android devices.