Seems have the same problem. The solution is baybe found in our filesystem. I came from f2fs filesystem, changed for /data and /cache partitions. All you need to do is perform a total data backup into a pc or mass storage, then perform a full wipe for thoose partition and, with TWRP 3, go to Mount > Repair / Change filesystem and then select the partition you need to change and format it into ext4 filesystem. If you're not sure that's it your problem, when you go at Repair/Change filesystem, recovery shows you the actual filesystem for the selected partition, and this filesystem needs to be ext4 for this ROM.