pendulum.now() is inconsistent when using the TZ env variable

[guiwoda]

Example, when using TZ=Europe/Berlin

>>> import pendulum
>>> pendulum.now()
<Pendulum [2020-09-01T18:53:49.977333+02:00]>
>>> pendulum.now(tz='Europe/Berlin')
<Pendulum [2020-09-01T20:54:02.361281+02:00]>
>>> pendulum.now().timezone.name
'Europe/Berlin'
>>> pendulum.now(tz='Europe/Berlin').timezone.name
'Europe/Berlin'

The correct time was 18:53 (the one given without the tz parameter). It seems that, if tz is sent, it doesn't check what the system date timezone is and assumes it's on UTC, so it moved it to +2 when it shouldn't.