Qiskit's draw only shows the circuit's name and not the architecture

Upon trying to draw a ZZFeatureMap instance, I only see the name "ZZFeatureMap" and not its architecture. Please find the code snippet and output attached:

from qiskit.circuit.library import ZZFeatureMap
zz = ZZFeatureMap(2, entanglement="full", reps=2)
zz.draw("mpl")

However, print(zz) prints the architecture of the circuit but it is not drawn with matplotlib.

Please help me draw the internals of the architecture of circuit with the draw() function. Thank you!