[Lenovo ZUK Z2 (Plus) ROMs, Kernels, Recoveries, & ] linuxnoobbbb:
Not booting after manually upgrading to 18.1 20211111 with TWRP. Decryption prompt didn't show up. I'm now reverting to 17.1.

Flashed OpenGapps stock (excluded some apps to save some space). Patched boot.img with Magisk. Encryption (FDE) has been enabled for quite some time.

Got this logcat after enabling adb through editing /system/etc/prop.default:

11-13 08:54:32.841 1557 1557 F appproc : app_process: Unable to determine ABI list from property ro.product.cpu.abilist32.
11-13 08:54:32.841 1557 1557 F libc : Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 1557 (app_process32), pid 1557 (app_process32)
11-13 08:54:32.870 1563 1563 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
11-13 08:54:32.870 1563 1563 F DEBUG : LineageOS Version: 'unknown'
11-13 08:54:32.870 1563 1563 F DEBUG : Build fingerprint: 'ZUK/z2_plus/z2_plus:unknown/unknown/unknown:unknown/unknown'
11-13 08:54:32.870 1563 1563 F DEBUG : Revision: '0'
11-13 08:54:32.870 1563 1563 F DEBUG : ABI: 'arm64'
11-13 08:54:32.870 1563 1563 F DEBUG : Timestamp: 2021-11-13 08:54:32+0000
11-13 08:54:32.870 1563 1563 F DEBUG : pid: 1556, tid: 1556, name: app_process64 >>> /system/bin/app_process64 <<<
11-13 08:54:32.870 1563 1563 F DEBUG : uid: 0
11-13 08:54:32.870 1563 1563 F DEBUG : signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
11-13 08:54:32.871 1563 1563 F DEBUG : Abort message: 'app_process: Unable to determine ABI list from property ro.product.cpu.abilist64.'
11-13 08:54:32.871 1563 1563 F DEBUG : x0 0000000000000000 x1 0000000000000614 x2 0000000000000006 x3 0000007fe41a5010
11-13 08:54:32.871 1563 1563 F DEBUG : x4 0000000000000000 x5 0000000000000000 x6 0000000000000000 x7 7f7f7f7f7f7f7f7f
11-13 08:54:32.871 1563 1563 F DEBUG : x8 00000000000000f0 x9 20afbbadface79f4 x10 ffffff80ffffffdf x11 ffffffc0ffffffdf
11-13 08:54:32.871 1563 1563 F DEBUG : x12 0000000000000000 x13 0000000000000000 x14 0000000000000000 x15 000000000146d2f6
11-13 08:54:32.871 1563 1563 F DEBUG : x16 0000007857787c78 x17 0000007857769c20 x18 000000785d0f2000 x19 00000000000000ac
11-13 08:54:32.871 1563 1563 F DEBUG : x20 0000000000000614 x21 00000000000000b2 x22 0000000000000614 x23 00000000ffffffff
11-13 08:54:32.871 1563 1563 F DEBUG : x24 00000063610ad034 x25 0000000000000005 x26 00000063610b2088 x27 0000000000000001
11-13 08:54:32.871 1563 1563 F DEBUG : x28 000000785c208000 x29 0000007fe41a5090
11-13 08:54:32.872 1563 1563 F DEBUG : lr 000000785771b56c sp 0000007fe41a4ff0 pc 000000785771b598 pst 0000000000000000
11-13 08:54:32.875 1563 1563 F DEBUG : backtrace:
11-13 08:54:32.875 1563 1563 F DEBUG : #00 pc 000000000004e598 /apex/com.android.runtime/lib64/bionic/libc.so (abort+176) (BuildId: 6fef2b0ca43a1525af04ae1c6da427de)
11-13 08:54:32.875 1563 1563 F DEBUG : #01 pc 00000000000062a0 /system/lib64/liblog.so (__android_log_default_aborter+12) (BuildId: b5e84530b2278e3780a02ed82997eafa)
11-13 08:54:32.875 1563 1563 F DEBUG : #02 pc 0000000000006dfc /system/lib64/liblog.so (__android_log_assert+336) (BuildId: b5e84530b2278e3780a02ed82997eafa)
11-13 08:54:32.875 1563 1563 F DEBUG : #03 pc 0000000000003750 /system/bin/app_process64 (main+1800) (BuildId: 576b5cec43a5536af58efd0f281bade1)
11-13 08:54:32.875 1563 1563 F DEBUG : #04 pc 0000000000049aec /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+108) (BuildId: 6fef2b0ca43a1525af04ae1c6da427de)

After editing /vendor/build.prop:

11-13 09:11:24.118 1433 1433 E Zygote : Error preloading android.content.pm.PackageParser.
11-13 09:11:24.118 1433 1433 E Zygote : java.lang.ExceptionInInitializerError
11-13 09:11:24.118 1433 1433 E Zygote : at android.content.pm.PackageParser.<clinit>(PackageParser.java:300)
11-13 09:11:24.118 1433 1433 E Zygote : at java.lang.Class.classForName(Native Method)
11-13 09:11:24.118 1433 1433 E Zygote : at java.lang.Class.forName(Class.java:454)
11-13 09:11:24.118 1433 1433 E Zygote : at com.android.internal.os.ZygoteInit.preloadClasses(ZygoteInit.java:302)
11-13 09:11:24.118 1433 1433 E Zygote : at com.android.internal.os.ZygoteInit.preload(ZygoteInit.java:134)
11-13 09:11:24.118 1433 1433 E Zygote : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:900)
11-13 09:11:24.118 1433 1433 E Zygote : Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
11-13 09:11:24.118 1433 1433 E Zygote : at android.os.Build$VERSION.<clinit>(Build.java:367)
11-13 09:11:24.118 1433 1433 E Zygote : ... 6 more
11-13 09:11:24.182 1433 1433 E Zygote : System zygote died with exception
11-13 09:11:24.182 1433 1433 E Zygote : java.lang.ExceptionInInitializerError
11-13 09:11:24.182 1433 1433 E Zygote : at android.content.pm.PackageParser.<clinit>(PackageParser.java:300)
11-13 09:11:24.182 1433 1433 E Zygote : at java.lang.Class.classForName(Native Method)
11-13 09:11:24.182 1433 1433 E Zygote : at java.lang.Class.forName(Class.java:454)
11-13 09:11:24.182 1433 1433 E Zygote : at com.android.internal.os.ZygoteInit.preloadClasses(ZygoteInit.java:302)
11-13 09:11:24.182 1433 1433 E Zygote : at com.android.internal.os.ZygoteInit.preload(ZygoteInit.java:134)
11-13 09:11:24.182 1433 1433 E Zygote : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:900)
11-13 09:11:24.182 1433 1433 E Zygote : Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
11-13 09:11:24.182 1433 1433 E Zygote : at android.os.Build$VERSION.<clinit>(Build.java:367)
11-13 09:11:24.182 1433 1433 E Zygote : ... 6 more
11-13 09:11:24.189 1437 1437 E Netd : Error adding route 0.0.0.0/0 -> (null) dummy0 to table 1003: File exists
11-13 09:11:24.190 1437 1437 E Netd : Unable to create netlink socket for family 5: Protocol not supported