[Moto Z2 Force  ROMs, Kernels, Recoveries, & Other ] ph03n!x:
I couldn't test anything so long because of lockdown - I was stuck in a different city, and did not have my usual computer to fastboot and stuff :)

Decryption, Backing up, and Restore works fine, tested all three with LOS17.1 - I disabled lockscreen password just in case (force of habit)

Installing a new ROM is not working, I am attaching the log file - I tried with two office LOS 17.1 nightly - 4/30 (had this saved) and 5/30

[0531/040801.576082:INFO:action_processor.cc(143)] ActionProcessor: starting FilesystemVerifierAction
Step 2/2[0531/040801.576105:INFO:filesystem_verifier_action.cc(108)] Hashing partition 0 (boot) on device /dev/block/bootdevice/by-name/boot_a
[0531/040801.824862:INFO:filesystem_verifier_action.cc(199)] Hash of boot: qGYb4LakbEw08bEsxubQ/FXXuo1zo/jaH1YvjupuT34=
[0531/040801.828779:INFO:filesystem_verifier_action.cc(108)] Hashing partition 1 (system) on device /dev/block/bootdevice/by-name/system_a
I:TWFunc::Set_Brightness: Setting brightness control to 5
I:TWFunc::Set_Brightness: Setting brightness control to 0
[0531/040838.633812:INFO:filesystem_verifier_action.cc(199)] Hash of system: luhLuFfF/y1io7pyPc4VbsQnvhApUycWzxF+TkUiE3U=
[0531/040839.037172:INFO:filesystem_verifier_action.cc(108)] Hashing partition 2 (vendor) on device /dev/block/bootdevice/by-name/vendor_a
[0531/040850.858106:INFO:filesystem_verifier_action.cc(199)] Hash of vendor: 5AJYTG3EzqorWAQH+SYgaqmL2hbmikHNWu0omoEffXg=
[0531/040850.993922:INFO:action_processor.cc(116)] ActionProcessor: finished FilesystemVerifierAction with code ErrorCode::kSuccess
[0531/040850.993983:INFO:action_processor.cc(143)] ActionProcessor: starting PostinstallRunnerAction
[0531/040850.996492:INFO:postinstall_runner_action.cc(174)] /dev/block/bootdevice/by-name/system_b has been mounted R/W 0 times.
[0531/040850.996518:INFO:postinstall_runner_action.cc(188)] Skipping backuptool scripts
[0531/040850.996540:INFO:utils.cc(693)] Not a mountpoint: /postinstall
[0531/040850.998642:INFO:postinstall_runner_action.cc(213)] Performing postinst (system/bin/otapreopt_script at /postinstall/system/bin/otapreopt_script) installed on device /dev/block/bootdevice/by-name/system_a and mountable device /dev/block/bootdevice/by-name/system_a
[0531/040850.998670:INFO:postinstall_runner_action.cc(220)] Format file for new system/bin/otapreopt_script is: data
[0531/040851.001973:INFO:subprocess.cc(152)] Subprocess exited with si_status: 127
[0531/040851.002000:INFO:subprocess.cc(156)] Subprocess output:
[0531/090851.001485:ERROR:process.cc(303)] Exec of /postinstall/system/bin/otapreopt_script failed:: No such file or directory

[0531/040851.002250:ERROR:postinstall_runner_action.cc(346)] Postinst command failed with code: 127
[0531/040851.002271:INFO:postinstall_runner_action.cc(366)] Ignoring postinstall failure since it is optional
[0531/040851.003347:ERROR:boot_control_recovery.cc(169)] Unable to set the active slot to slot A: Operation not permitted
[0531/040851.003371:ERROR:postinstall_runner_action.cc(396)] Postinstall action failed.
[0531/040851.003390:INFO:action_processor.cc(116)] ActionProcessor: finished last action PostinstallRunnerAction with code ErrorCode::kPostinstallRunnerError
[0531/040851.003410:INFO:update_attempter_android.cc(447)] Processing Done.
Error applying update: 5 (ErrorCode::kPostinstallRunnerError)[0531/040851.003500:ERROR:prefs.cc(85)] storage_->DeleteKey(key) failed.
Updater process ended with ERROR: 1
I:Install took 183 second(s).
Error installing zip file '/external_sd/Inst/lineage-17.1-20200430-nightly-nash-signed.zip'

Attaching the recovery.log in case more details are needed!