I think they are trying to sort out the structure and new appointments within that structure before sorting out the manager.
In an ideal world that would make sense: they reach out to Alonso, tell him you are our number one option, sit back and concentrate on winning the title in Germany whilst we sort out our structure, then we sit together. In the real world, however, Bayern and Tuchel have decided to divorce in the summer, and Alonso is now their number one option.