Yes you have this problem because you have installed the dream2lte version of the rom and your twrp is dreamlte, you ahve to flash both with dreamlte!
i didnt
i flashed dreamlte version of LOS 19 ROM then dreamlte version of TWRP 3.6 and it booted
then after a while i flashed dreamlte version of LOS 16 from TWRP backup and i could not boot into the ROM
and then i could not boot into TWRP
i flashed dreamlte TWRP 3.2 and it still wouldnt boot into TWRP
i flashed dreamlte orangefox and it still wouldnt boot into orangefox
then i flashed dreamlte twrp 3.1.1-2 and it booted
but when i tried to manually install dreamlte version of LOS 16 but it said it requires dreamlte and my device is .
so i tried restoring TWRP 3.6 and LOS 19 and it still wouldnt boot into either
so i tried flashing my original stock S8 ROM TWRP backup and it booted
then i flashed dreamlte TWRP 3.2 and it booted
then i flashed dreamlte orangefox and it booted
then i flashed dreamlte version of LOS 16 and worked and it booted
then i flashed dreamlte version of LOS 16 from TWRP backup and it booted