I'm looking into this gap right now. In the US for example, deaths from dementia so far this year are much higher than the average for the past five years (up until ~Aug 15). There's also a not insignificant amount of notes saying deaths are being underreported in a lot of jurisdictions.

Pretty much across the board jumps for most major causes of death. Haven't pulled in anything on suicides yet. Interestingly though, deaths from lower respiratory disease are down for all regions of the US. I wondered how much that has to do with less traffic/air pollution which might otherwise aggravate that?