Looking at the 19.7.3 issues for known and fixed, you can see several entries for the VII. I think AMD really messed up the VII with the 5700 implementation and addition to the drivers, and now that the VII has effectively been put on end of life status, the VII will forever be the redheaded stepchild of AMD GPUs.
The last good driver for me, which still has a few bugs, is the 19.4.3 driver. My experience with the VII has soured me to anything by AMD. They just can't write drivers.