I started a gameplay with Germany in 1918 just to test it, and in 1922 I won the war (even if Austria-Hungary broke 4 months before).
I then waited until 1934 just creating troops and researching and becoming fascist (before 1934 I aloready researched all naval, flying and warfare techs...).
In 1934 I researched "night on the long knife" and automatically I skipped "Rheinland" focus.
I researched "Anschluss" and "Sudetenland" but nothing happened.
I presume something is broken with the focus tree