Reported by @darton in #47 (comment) and adafruit/Adafruit_Blinka#210 (comment):

The problem with 100% usage of libgpiod_pulsein CPU on Raspberry Pi with DHT22 still exists.

However, sometimes you have to wait several hours for it to appear and permanently prevent reading data from the DHT22 sensor.

After today's update to the version below, the script runs 8 hours without any problems.

Raspbian GNU/Linux 10 (buster)
Raspberry Pi 3 Model B Plus Rev 1.3
Python 3.7.3
Adafruit-Blinka-5.3.4
Adafruit-PlatformDetect-2.16
Adafruit-PureIO-1.1.5 RPi.GPIO-0.7.0
adafruit-circuitpython-dht-3.5.1
pyftdi-0.51.2 pyserial-3.4 pyusb-1.0.2
rpi-ws281x-4.2.4 sysv-ipc-1.0.1

But after 8 hours, the problem came back.