In the research tree for the tanks, the light tank (1945 model, displayed as "advanced_light_tank_a") when researched does not replace the T-70 1941 research light tank in the production menu and does not show up. the same is true for all tanks after 1947, such as the medium 1947 tank: "main_battle_tank_a"

I do not own any DLCs for this game, so I'm not sure if this is a bug related to the fact that I do not own the tank designing DLC.

Screenshot of the focus menu: https://imgur.com/a/3LmYJqs