Plague Bearer quality shows "Stores up to 0 Poison Damage"

After adding quality to Plague Bearer, the tooltip updates to “Stores 2% of Expected Poison Damage,” but the next line always shows “Stores up to 0 Poison Damage.”

Expected Result:
Stores 2(0-2)% of Expected Poison Damage, up to 7628

Actual Result:
Stores 2(0-2)% of Expected Poison Damage, up to 0

Is this just a visual bug, or does it actually mean I’m losing stored poison damage (maybe even ~50% of my damage)?