[Python] How to properly convert Pytube bufferIO to numpy array representing sine wave?

Problem: I'm trying to download audio from Youtube via Pytube, save it to buffer (I don't want to save the audio to drive) and then convert it to numpy array in order to plot a raw audio wave. After conversion I'm trying to convert it back to sound and instead of 12 minutes of audio from a video, I'm getting 12 seconds of static noise. When saving buffer to .mp4 everything seems to be working just fine. I'm quite lost and would appreciate any help.

Program:

from IPython.display import Audio
from pytube import YouTube
import numpy as np
from io import BytesIO

yt = YouTube('https://www.youtube.com/watch?v=zrqqrQmeQS4')

# getting audio stream
audioStreams = list(map(lambda streamObj: streamObj.itag, yt.streams.filter(only_audio=True)))
activeStream = yt.streams.get_by_itag(audioStreams[0])

# saving to buffer
bufferObj = BytesIO()
activeStream.stream_to_buffer(bufferObj)

# saving buffer to ndarray
bufferObj.seek(0)
points_array = np.frombuffer(bufferObj.read())

# preprocessing raw numpy data
points_array = np.round(points_array,10)
points_array[np.isinf(points_array) | np.isnan(points_array)] = 0

return Audio(points_array, rate=44.1 * 1000)

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