Worked here on a completely wiped May image (stock/rooted 3 XL) that failed to decrypt on the previous versions (needed to turn off PIN) of TWRP. Fastboot boot decrypyed with my PIN, advanced>install recovery ramdisk installed .img that I had placed on the phone, reboot to system looped back to TWRP where I rooted with Magisk 19.1 (I forgot to put a copy of 19.2 on the phone). Updated Magisk with direct install from MM, rebooted to recovery, and 3.3.1-1 was in place/decrypted with PIN. I even ran a backup while I was in there since I had it open. Bottom line is that all appears to be well.