Arrow shift method is not handling DST properly

[ChippingEye2766]

Issue Description

My understanding of shift method was it will take care of DST. However when testing for 10 hours shift on 2025-03-08T18:30:00 with US/Central and 10 hours shift the expected output should be 2025-03-09T05:30:00-05:00 but I am getting 2025-03-09T04:30:00-05:00. Fyi, DST changes on March 9, 2025. At 2 a.m

# Step 1: Create a timezone-aware datetime using Arrow
start = arrow.get("2025-03-08T18:30:00").format('YYYY-MM-DDTHH:mm:ss')  # starting datetime
start_tz = arrow.get(start).replace(tzinfo='US/Central')  # Set the timezone to US/Central

# Step 2: Shift by 10 hours
shifted = start_tz.shift(hours=10)

# Step 3: Print the result
print(shifted)  # Should print: 2025-03-09T05:30:00-05:00 (after DST transition) but getting <Arrow [2025-03-09T04:30:00-05:00]>

System Info

• 🖥 OS name and version: macOS 15.3
• 🐍 Python version: 3.11.8
• 🏹 Arrow version: 1.3.0

[ChippingEye2766]

Shifting the hours from 25 to 26 doesnt change the date. It is quite random on when the method is messing this up

>>> start_tz = arrow.get(arrow.get("2025-03-08T01:59:00").format('YYYY-MM-DDTHH:mm:ss')).replace(tzinfo='US/Central')
>>> start_tz.shift(hours=24)
<Arrow [2025-03-09T01:59:00-06:00]>
>>> start_tz.shift(hours=25)
<Arrow [2025-03-09T03:59:00-05:00]>
>>> start_tz.shift(hours=26)
<Arrow [2025-03-09T03:59:00-05:00]>

[ChippingEye2766]

Attaching another example. Looks like it happens when we are shifting and crossing 4am boundary with DST change

>>> start = arrow.get("2025-03-08T18:30:00").format('YYYY-MM-DDTHH:mm:ss')
>>> start_tz = arrow.get(start).replace(tzinfo='US/Central')
>>> shifted = start_tz.shift(hours=9)
>>> print(shifted)
2025-03-09T03:30:00-05:00
>>> start = arrow.get("2025-03-08T18:30:00").format('YYYY-MM-DDTHH:mm:ss')
>>> start_tz = arrow.get(start).replace(tzinfo='US/Central')
>>> shifted = start_tz.shift(hours=8)
>>> print(shifted)
2025-03-09T03:30:00-05:00