cf aggregation not working properly: cf-python issue or metadata issue?

[bnlawrence]

TIcket #3 describes a problem with some field metadata, but it also describes an aggregation problem: There are eight hourly monthly mean at a particular time of the day, and one all month average, and three 10 day 24h averages, there ought to be three aggregations ...
HORIZON-CL5-2023-D1-01-01: Further climate knowledge through advanced science and technologies for analysing Earth Observation and Earth System Model dataΩ

$files = index['surface_temperature:OPEN SEA SURFACE TEMP AFTER TIMESTEP']
$print(files)
['1m_0h__m01s00i507_2_195001-195001.nc', '1m_12h__m01s00i507_6_195001-195001.nc', 
   '1m_15h__m01s00i507_7_195001-195001.nc', '1m_18h__m01s00i507_8_195001-195001.nc', 
   '1m_21h__m01s00i507_9_195001-195001.nc', '1m_3h__m01s00i507_3_195001-195001.nc', 
   '1m_6h__m01s00i507_4_195001-195001.nc', '1m_9h__m01s00i507_5_195001-195001.nc', 
   '1m__m01s00i507_195001-195001.nc', '3h__m01s00i507_10_19500101-19500110.nc', 
   '3h__m01s00i507_10_19500111-19500120.nc', '3h__m01s00i507_10_19500121-19500130.nc']
$flds = index.get_fields('surface_temperature:OPEN SEA SURFACE TEMP AFTER TIMESTEP',
    'u-cn134-1fpf/19500101T0000Z/')
It then does the aggregation to the two CF-fields that are really in play:

$print(flds)
[<CF Field: surface_temperature(time(241), latitude(324), longitude(432)) K>,
 <CF Field: surface_temperature(time(8), latitude(324), longitude(432)) K>]

It appears that the one month average has been aggregated into the 3h fields. Is this a metadata problem or a cf-python aggregation problem?

(Kudos for @jeff-cole for spotting this, I missed it, and even after he pointed it out, needed to be spoonfed as to what teh actual problem was.)