Physician Perk not curing disease

[Random_White_Guy]

A small matter but-

"You grew up learning the basics of healing. You're proud to say that your abilities as a healer have never relied on the ineffable whims of the gods."

Level 5: +4 Heal, +2 Saves Vs. Disease and Poison

Pure Bonus: Healed of disease after rest. The healing rate of Medicinal Herbs is increased by 1.

The physician perk does heal disease after rest but the check seems to come after the disease check when resting meaning sickness effects for a failed save roll can still be applied reducing your stats from whatever disease you possess.  Nothing major of course but still does the damage of disease. Not sure if that's fixable or just nature of the game?