[OnePlus 3 & 3T Cross Device Development] DroidFreak32:
Yeah, I have faced issues with this as well. Even faced issues with ext4 after coming from 9+ ROMs due to the filesystem changes introduced within the kernel from Android 8+.

The TWRP is also built with the kernel source of Oreo and that explains why we are facing issues on both the ROM and the recovery.

I did try to merge the new changes in f2fs but ended up with a lot of conflicts and the kernel not being built so I decided to drop working on it.

Clean wipe with ext4 is the way to use the ROM if you are coming from a higher android version.

I thought I had fixed this previously, thanks for bringing this to my attention. I will fix this when I get time to build the next build.

Yep, crashed for me as well :/

--------- beginning of crash
11-04 12:00:30.194 6800 6800 E AndroidRuntime: FATAL EXCEPTION: main
11-04 12:00:30.194 6800 6800 E AndroidRuntime: Process: com.android.settings, PID: 6800
11-04 12:00:30.194 6800 6800 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.settings/com.android.settings.rr.SlimRecentAppSidebarActivity}: java.lang.IllegalStateException: Must specify preferenceTheme in theme
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2699)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2766)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.ActivityThread.-wrap12(ActivityThread.java)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java:102)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.os.Looper.loop(Looper.java:154)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java:6236)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)
11-04 12:00:30.194 6800 6800 E AndroidRuntime: Caused by: java.lang.IllegalStateException: Must specify preferenceTheme in theme
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.support.v14.preference.PreferenceFragment.onCreate(PreferenceFragment.java:221)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at com.android.settings.rr.RecentAppSidebarFragment.onCreate(RecentAppSidebarFragment.java:38)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.Fragment.performCreate(Fragment.java:2336)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:949)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.BackStackRecord.setLastIn(BackStackRecord.java:860)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.BackStackRecord.calculateFragments(BackStackRecord.java:900)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.BackStackRecord.run(BackStackRecord.java:728)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1578)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.FragmentController.execPendingActions(FragmentController.java:371)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.Activity.performStart(Activity.java:6700)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2662)
11-04 12:00:30.194 6800 6800 E AndroidRuntime:	... 9 more
11-04 12:00:30.199 946 1855 W ActivityManager: Force finishing activity com.android.settings/.rr.SlimRecentAppSidebarActivity
11-04 12:00:30.201 946 1855 W ActivityManager: Force finishing activity com.android.settings/.SubSettings
11-04 12:00:30.203 946 1855 W ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:877 com.android.server.am.AppErrors.crashApplicationInner:391 com.android.server.am.AppErrors.crashApplication:325 com.android.server.am.ActivityManagerService.handleApplicationCrashInner:13781 com.android.server.am.ActivityManagerService.handleApplicationCrash:13763
11-04 12:00:30.257 946 6208 I OpenGLRenderer: Initialized EGL, version 1.4
11-04 12:00:30.257 946 6208 D OpenGLRenderer: Swap behavior 1
11-04 12:00:30.462 6505 6605 W Process : Unable to open /proc/self/io
11-04 12:00:30.701 946 1022 W ActivityManager: Activity pause timeout for ActivityRecord{be5c7df u0 com.android.settings/.rr.SlimRecentAppSidebarActivity t26 f}

This may be related: https://stackoverflow.com/questions...s-preferencetheme-to-be-set/32073430#32073430

Same as this: