Prior to each test I used flash-all.bat with factory image taimen-rp1a.201005.004.a1-factory-2f5c4987.zip
Thus all firmware is up to date prior to my attempts.
fails when booting with the command:
fastboot boot twrp-3.5.0_9-1-taimen.img
The screen flickers/flashes the twrp logo and fails to boot twrp.
succeeds when booting with the command:
fastboot boot twrp-3.5.0_9-0-taimen.img
Temporarily booting twrp-3.5.0_9-0-taimen.img, I then attempted to install twrp-installer-3.5.0_9-1-taimen.zip.
This successfully installed but resulted in the same flickering/flashing of the twrp logo and a failure to boot into recovery.
Temporarily booting twrp-3.5.0_9-0-taimen.img, I then attempted to install twrp-installer-3.5.0_9-0-taimen.zip
This successfully installed and allowed me access to twrp recovery.
Unless I am missing something twrp-installer-3.5.0_9-0-taimen.zip
is the most stable version and was capable of decrypting the 4 digit pin encryption on my device.
There might be a bug or something that we are missing that is causing a problem for lg_g3_d855
and I as their post was recent enough to have used the very new twrp-3.5.0_9-1 for taimen.
This is the unlocked version of the Pixel 2XL on Verizon.