The Staatsgerichtshof and only that court was competent for ruling on the constitutionality of laws; it founf in 1932 that the ousting of the center-left Prussian state government by the right-wing Reich government had been unconstitutional but balked at ordering it reversed.
German courts at the time were mostly right of center in their sympathies, and the doctrine of legal positivism (basically, that statute law cannot be invalid) dominated.
Right after Hitler‘s being appointed Chancellor on 30 January 1933 the remaining possibly non-compliant jurists were purged or sufficiently intimidated. No court wanted or dared to gainsay the decrees and laws that implemented dictatorship in 1933/34.
The lesson learned was that Germany needed a Constitutional Court with teeth. That was implemented in the current constitution, the 1949 Grundgesetz, and the Constitutional Court has been a thorn in the side of executives and legislative majorities ever since.