[Samsung Galaxy J4+ ROMs, Kernels, Recoveries, & Ot] Andhika24kd:
Some notes and bugs encountered by me on J415F:

1) No face unlock option even after flashing GApps.

Workaround

: use other screen lock method

2) SIM 2 will be named as 'CARD 2' instead of its real name on many occasions.

Workaround

: Change your SIM 2 name manually from Settings -> Network & internet -> SIM Cards -> SIM slot 2. This may happen because your SIM carrier is unrecognized by Android

3) Samsung Pay and Samsung Max are there.

Workaround

: Remove the APKs manually using File Manager that supports root feature. They are located inside ./odm/app

4) If Android cant 'sign in to network' on SIM 1. It will display an error referring to SIM 2's name. It will also use mobile data from SIM 2 instead (pic 1, pic 2).

No workaround

5) Bluelight filter not working (won't change settings).

Workaround

: Use 3rd party app to filter it (such as CF.Lumen)

6) Saved screenshot shows a blank preview image (on notification list).

No workaround

7) Removing system apps cause bootloop.

Workaround

: Just disable it or use ADB to uninstall it instead (current user only)

8) MTP/PTP still not working, will show an error when copying files.

Workaround

: Use 3rd party file sharing apps like ShareIt or AirMore

9) Download manager is buggy, taking long time or failed to download something (for example Magisk module), or download file with strange name (instead of its real name on Jelly browser).

Workaround

: Restart the device at least once or use other browser like Chrome or Firefox (Lite)

10) 'Files' app shows an error when renaming file (but it actually works).

No workaround

11) Bluetooth keeps stoping when accessed/enabled by apps (example: Google Play Games).

No workaround?

12) When setting navigation bar to compact mode (or other mode), the 'change rotation' button (if you don't use auto rotate) will appear behind/on top of/in the middle of other navigation buttons.

Workaround

: Use the default one or use 'Gesture' navigation bar instead. This may happen if you change your screen 'Display size' (aka DPI) from Settings -> Display

13) Changing navigation bar to lefty/righty may cause the navigation bar to disappear.

Workaround

: Reboot the device at least once or use the same workaround as above

14) Changing home screen wallpaper will also change lock screen wallpaper and using custom image as wallpaper will cause the default 'Wallpaper' app to crash.

Workaround

: Use other app to change wallpaper (such as Google Wallpaper app)

15) Lock screen message does not appear, although emergency message/info works fine.

Workaround

: Change it and save it again (for the second time), if the problem stays reboot the device at least once

16) Keyboard will not appear on some conditions (like when writing app review on Play Store) and cause heavy lag or screen blinking.

Workaround

: Press home button and kill the 'hanging' app. Install alternative keyboard (such as G-Board or Simple Keyboard)

17) Changing accent color (from Settings -> Display -> Style) will not change 'Trebuchet' launcher accent color.

Workaround

: Change it to other color and save it again. If the problem persist force stop the launcher or reboot the device

18) 'Trebuchet' launcher is using light theme even after I change the system style color to Dark/AMOLED.

Workaround

: Change your wallpaper to a darker one

19) Notifications are still on white color even after I change the system style color to Dark/AMOLED.

Workaround

: Use 3rd party theming app (such as Substratum) or Xposed module or whatever

20) Signal bar is empty on both SIMs but mobile data, SMS, and phone work fine.

No workaround?

21) Some apps notifications (like Messaging app) will be delayed or not showing up at all if 'Do no disturb' mode is activated.

Workaround

: Check it manually, of course

22) Minor UI bugs here and there that doesn't affect anything (maybe also DPI related issue) (pic 1, pic 2, pic 3).

No workaround?

Some of this may be features/limitations of AOSP and LineageOS, not actually bugs. Tested on beta 3 release, will always update this post once I found new bugs. Thanks for the ROM by the way. Cheers :)