'XX hours YY min ago' gives incorrect output about parsedatetime HOT 1 OPEN

>>> from datetime import datetime
>>> import parsedatetime as pdt
>>> cal = pdt.Calendar(version=pdt.VERSION_CONTEXT_STYLE)
>>> reference_date =  datetime(2021, 8, 12, 12, 0, 0)
>>> cal.parseDT('11 hours ago', sourceTime=reference_date)[0]
2021-08-12 01:00:00
>>> cal.parseDT('11 hours 0 minutes ago', sourceTime=reference_date)[0]
2021-08-12 23:00:00
>>> cal.parseDT('11 hours ago 0 minutes ago', sourceTime=reference_date)[0]
2021-08-12 01:00:00

import re
from datetime import datetime
import parsedatetime as pdt

def parse_with_ago(phrase, ref_dt):
    regex = r'\s(ago|before)(\s|$)'
    cal = pdt.Calendar(version=pdt.VERSION_CONTEXT_STYLE)
    phrase, did_have_ago = re.subn(regex, ' ', phrase)

    parsed, context = cal.parseDT(phrase, sourceTime=ref_dt)
    if did_have_ago == 0: # No ago or before detected
        return parsed

    # Ago or before detected
    td = parsed - ref_dt
    phrase = '{} days ago {} seconds ago'.format(td.days, td.seconds)
    parsed, context = cal.parseDT(phrase, sourceTime=ref_dt)
    return parsed

now = datetime(2021, 8, 12, 12, 0, 0)
date = parse_with_ago('11 hours 0 minutes ago', now)
print(date) # 2021-08-12 01:00:00

date = parse_with_ago('11 hours ago', now)
print(date) # 2021-08-12 01:00:00


date = parse_with_ago('1000 years ago', now)
print(date) # 1021-08-13 12:00:00

date = parse_with_ago('1000 years 0 months 0 days 0 hours 0 minutes 0 seconds ago', now)
print(date) # 1021-08-13 12:00:00