Oke thanks i understand now thank youYes, you have to backup your data to anywhere else than internal storage, because you have to format it. Then you can flash the ROM and use it normally, TWRP can't decrypt the encrypted data of Android 12 doesn't affect you to use the ROM, that's two totally different thing.
i have never dirty flashed so i always do it like you mentioned ahahaha.
I also would like to know this.
@Yokurt815 doesnt lineage os always block it ? as far as i know you either need to patch it or use a linage os specific lineage rom that comes with microg build in. also i dont know how it works with unofficial lineage os? nor android 12