Question mark (?) on the output of Keras plot_model

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Using Keras, I am plotting my model this way:

import keras
import pydotplus
from keras.utils.vis_utils import model_to_dot
keras.utils.vis_utils.pydot = pydot

#plot_model(loaded_model, to_file='model.png')

tf.keras.utils.plot_model(loaded_model, to_file='model_plot.png', show_shapes=True, show_layer_names=True)

The plotting works, however, I am getting question marks ("?") on the first of each shape. For example: input: [(?,1250,2)]

Is the question mark the same as "none"? (the "none" was explained here) If not, what is the reason for the "?"?

enter image description here

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