It is quite common loading. Nothing special. At the end of cantilever, if I add railing or parapet wall, it will give moment, increasing upto the first support. On rest of the beam, similarpossibility with varying tip load.

Floating columns are the major source of such type of BM as the floating columns transfers concentrated load on the supporting beams.

as far as i know, this loading can be seen in the construction of the pier above the sea. in practice you can see it when heavy machine lift concrete column or concrete pile