Still happens. Though I narrowed down the odor. This might be harsh for some but growing up hunting for me it smells like a cold deer carcass, specifically when you peel the hide off and the fat layer and hide is exposed to the air. To me it smells exactly like that. I found beef, butter, animal oils, when I pass gass, have a bowel movement....all smells just like that. Passed something dead along side the road, and my wife made comment that is smells like a dead skunk. I only smelled that deer fat smell. I was sort of giddy today, someone's service dog crapped on the floor in walmart and walking by it with my wife goine "Eeew" I smelled that deer fat smell but also a hint of dog feces. So I was relieved I could smell that.
I had Covid back in November but this all came about months later. My guess is that the sinus infection I got later is what is causing it. Hopefully it will wear off soon.