Hi support team,
A province in my KD seems to have a permanent duration BL. It is appearing in mystics as - duration. Screenshots can be furnished upon request.
Comparison:
My prov: 91 % BE, 111.7% military efficiency + 17.0% TG = 133% OME
His prov: 92 % BE, 110.5% military efficiency +12.0% TG = 139.8% OME
This leads me to believe that even after the game ticked, the offensive military efficiency bonus by BL was still active. I am not sure about the other effects.