Why did the Hungarian Diet declare the Habsburg-Lorraine dynasty dethroned in April 1849?

The Hungarian Diet declared the Habsburg-Lorraine dynasty dethroned on April 14, 1849, as a direct response to the Austrian government’s decision to abolish the March Laws.12

Following the abdication of Ferdinand in December 1848, his successor, Franz Joseph, oversaw the implementation of a pan-monarchic constitution that effectively stripped Hungary of the internal reforms and autonomy it had secured in 1848. In reaction to this move, a rump Diet, under the leadership of Lajos Kossuth, proclaimed Hungary’s full independence and the formal deposition of the Habsburg dynasty. This historic declaration took place in the city of Debrecen.123