Here are the steps that got me to where I am.
1. Stock Pixel XL March 2017
2. Installed TWRP
3. Installed SU
4. All worked correctly for the last month
5. Saw that there was a new April release
a. It would not install as I was rooted
b. I installed the April OTA using TWRP
c. Rebooted
6. Saw...