The following has been tested several times to ensure validity.
Plague ring - with a 20% reduction to max health gets doubled to 40% when health is below 50%. Since Plague Ring should not be affected by Molted black pearl on any gear peice this stat is not working as intended.
Plague enchant - (Max focus reduced by 19%) not working. With 200 focus points when equipping gear with this enchant the calculated amount does not get applied. Focus still sits at 200 points and is not affected.
Enchant - (Max stamina increased by x% of focus) this enchant does not calculate correctly. Current Max focus is 200, the current max stamina is 94. The gear i’m using has 4% of max focus increase. The increase putting on gear with the 4% increase only gives +2 for a total on 96. This stat should now be 102 not 96. “Bug or broken”
These tests were all done with only the affected stat by equipping only a single gear piece or ring to test.