You wouldn't divide ww2 into two separate wars because the germans and the soviets were allied in the first half of ww2 ( when they invaded poland and divided europe in half between them ) and then they fought a war against each other in the 2nd half.
The "continuation war" doesn't get much attention because of political reasons. Just like much of europe ( including france, most of scandinavia, netherlands, belgium, ukraine, etc ) underplays their cooperation with nazi germany for much of ww2 when nazi germany was on the ascent.
As they say, the first casualty of war is the truth. This applies not only during the war, but post-war as well.