Adding a timedelta to an aware datetime object not resulting in the correct time being calculated

[ben-n93]

Bug report

Bug description:

I am trying to understand why the time of the sydney_aedt object is not being adjusted to reflect the change in timezone offset:

import datetime
import zoneinfo

sydney_aest = datetime.datetime(2024, 8, 30, 15, 0, 0)
sydney_aest = sydney_aest.astimezone(zoneinfo.ZoneInfo("Australia/Sydney"))
print(sydney_aest)
sydney_aedt = sydney_aest + datetime.timedelta(days=90)
print(sydney_aedt)

Expected output:

2024-08-30 15:00:00+10:00
2024-11-28 16:00:00+11:00 # Clock moves forward an hour.

Actual output:

2024-08-30 15:00:00+10:00
2024-11-28 15:00:00+11:00 # Time is the same.

I would expected that with the change from AEST to AEDT the hour should move forward an hour however as you can see this is not the result.

CPython versions tested on:

3.12

Operating systems tested on:

macOS

[rruuaanng]

I'm sorry that I don't have a mac, but I will test it on win.