Although many Pixel 2 XL users have successfully upgraded, some Pixel 2 XL users have indicated an infinite loop restart during the upgrade process. And some Pixel 3 series users have the same problem, obviously this problem is not limited to Pixel 2 XL.
In the r / android_beta subreddit community, one user found that "factory reset" can solve this problem, but that means all your data needs to be lost. Another user said that there is no need to restore the factory design, only need to enter the recovery mode during the restart process, and then restart the device from the option to successfully enter the system.
The Android team has suspended the OTA update for Android Q Beta 4 to investigate this issue.