With how the title sounds you probably expecting a big mod here. But I can say it only fixes a few things.
These are minor fixes but were pretty annoying. This mod will most likely be removed when UMC is updated at the end of May and these are *Hopefully* fixed.
Fixed the crash when opening the officer corp tab after completing the Oberkommando der Wehrmacht decision.
Fixed the Japanese theorists not appearing.
Fixed one of the states in One People under the Rising Sun Flag from being a state in France to the proper Korean state.
Fixed the form Greater Germany Reich decision to only be selectable once.
Fixed the Fortify Shanghai focus to include Shanghai in the requirements and the state to which the forts are added.
Fixed Siam getting a state in Czechia during an event.