Qubit costs not getting displayed for intermediate bloqs in `show_call_graph(_modexp_small.make())`

[tanujkhattar]

Running show_call_graph(_modexp_small.make()) gives the following diagram:

For some reason, Qubits property is not displayed for a bunch of bloqs like CModMulK, CtrlScaleModAdd etc. I'm not sure what's going on here.