Error in datediff calculation

If i calculate the time difference between 2 datetime objects, the result is incorrect. Here an example:

import arrow
start = arrow.get('28.04.2022 14:00','DD.MM.YYYY HH:mm' )
end = arrow.now()
print(f'Start-Datetime: {start}')
print(f'End-Datetime : {end}')
print(f'Time-Difference: {end-start}')

Start-Datetime: 2022-04-28T14:00:00+00:00
End-Datetime : 2022-04-28T16:17:06.144073+02:00
Time-Difference: 0:17:06.144073

The correct Time-Difference should be 2:17:06......

## System Info

- 🖥 **Windows 10 21H1**:
- 🐍 **Python 3.9.9**:
- 🏹 **Arrow 1.2.1**:

No source file or test is named. Start by reproducing the supplied Python example with Arrow 1.2.1, then trace the datetime subtraction and timezone handling; the issue is done when the reported inputs produce the expected two-hour difference.

Written by the indexing model from the issue text.