TWRP boot loop on Z00T The last LineageOS OTA caused a TWRP boot loop.
I can get to fastboot with the volume keys.
I can use ./adb shell briefly before reboot.

./fastboot erase cache
./fastboot flash recovery twrp-3.1.1-0-Z00T.img


did not resolve the issue.
What can be done to get this device booted?
On Ubuntu 18.04

sudo apt install android-sdk-platform-tools-common fastboot
fastboot continue


Got me back to LineageOS.

It also seems to have fixed TWRP.