I guess the miner feature to increase ethash support on 4GB GPUs is not working with the old Blockchain drivers (22.19.659.1)?
I honestly dont know, havent tested. The reason is that you need newer drivers anyway to maximize the epoch for 4GBs, they have an overall lower memory footprint. I believe something like >= 19.11.3 is enough, but not 100% sure where they reduced the initial vram used.