[perl #127160] DateTime method .earlier thinks that the time is flowing backwards (DateTime.now.earlier(years => 15))

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# New Ticket Created by  Alex Jakimenko 
# Please include the string:  [perl #127160]
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Code:
say DateTime.now.earlier(years => 15)

Result:
2031-01-05T01:57:22.872850+01:00

It is a regression, it was working just fine earlier.

It seems like there are no tests for this particular case (.earlier with
days, months, etc. seems to be fine).