With the departure of Prime Minister Felix, the political scene in Austria also faced a reshuffle, and Franz appointed Finance Minister Karl as Prime Minister.
In fact, this was just an interim appointment. Carl-Ludwig Von Bruck was born during the Anti-French War, only seven or eight years younger than Felix.
Against the backdrop where stability was paramount, Franz didn't make any fuss. It was completely in accord with the government's operational rules that the Prime Minister resigned in advance and the second-ranked Finance Minister stepped up.
The Cabinet reshuffle would have to wait until the end of the term, which would be in 1889. In terms of timing, Karl's term as interim Prime Minister was not short.
By the time this term ended, Karl would also be nearing the age of retirement, conveniently making room for his successor.