In the treaty between the Austro-Hungarian Empire and the Allies, the Austro-Hungarian Empire repeatedly mentioned a clause that no Allied country should support Hungarian independence forces.
The Hungarian independence forces not only include the already well-known Independent Party in Hungary but also include capitalists and landowners who try to promote Hungarian independence.
If you have a map, you can clearly find out that the Austro-Hungarian Empire is mostly surrounded by mountains, and only the Hungarian region is one of the few plains in the Austro-Hungarian Empire.
This also leads to the Hungarian region being mostly based on a small agricultural economy, including a considerable number of farm owners and small capitalists.
The completely different economic models of the Hungarian region and Austria are also destined to cause conflicts between Hungary and Austria.
But for the Austro-Hungarian Empire, the empire cannot lose such an important granary as Hungary.