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Different seasonality length

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Description

Does Prophet support two different sizes of seasonality?
I have data with this season length: [...,21,21,21,21,21,28,21,21,....]
But train results look like: [...,21,21,21,21,21,28,14,21,....]
Seasons setup:
``
model.add_seasonality(name='21_season', period=21, fourier_order=10, condition_name='21_CAMPAIGN', mode="multiplicative")
model.add_seasonality(name='28_season', period=28, fourier_order=10, condition_name='28_CAMPAIGN', mode="multiplicative")
``
Results:
![image](https://user-images.githubusercontent.com/4380421/149504895-d70e22f8-f6e5-4a38-b152-a834d399efb3.png)

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