astimezone doesn't look to take the given timezone

[svaningelgem]

Python Version

3.9.13

pytest Version

7.1.2

Package Version

2.9.0

Description

from datetime import date, datetime, time, timezone

import time_machine


with time_machine.travel(datetime(2023, 2, 16, 7, 44, 0, tzinfo=timezone.utc)):
    now = datetime.combine(date.today(), time.min)  # For example 2023-02-16 00:00:00, but no timezone yet
    now = now.astimezone()  # Local timezone
    now_utc = now.astimezone(timezone.utc)
    assert now_utc.timestamp() == 1676505600, f'TS is said to be {now_utc.timestamp()}'

In this example on my computer (GMT+1) this fails.
I think the reason is because astimezone will bypass the time-machine and go to the system time to get the current timezone information. Instead of taking that from the mock?