Postgres 13

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

with the_data(json_col) as (
values(
'{
   "ticket":{
      "ticket":"61086762bb68d90001148fe9",
      "timestamp":"2021-08-02T18:45:06.581-0300"
   },
   "serie":{
      "measurement":{
         "nemo":"RT",
         "description":"Real Time"
      },
      "tagSet":{
         "Granularity":"1h",
         "Facility":"382"
      },
      "fieldSet":{
         "EnvTemperature":"°C",
         "HorizIrrad":"W/m2"
      }
   },
   "values":[
      {
         "tagSet":{
            "Facility":"382",
            "Granularity":"1h"
         },
         "fieldSet":{
            "EnvTemperature":7.0,
            "HorizIrrad":632.0
         },
         "time":"2021-08-02T11:00:00.000-0300"
      },
      {
         "tagSet":{
            "Facility":"382",
            "Granularity":"1h"
         },
         "fieldSet":{
            "EnvTemperature":10.0,
            "HorizIrrad":884.0
         },
         "time":"2021-08-02T12:00:00.000-0300"
      }
   ]
}'::jsonb)
)

select 
    (value->>'time')::timestamp as "time",
    (value->'fieldSet'->>'EnvTemperature')::numeric as "EnvTemperature",
    (value->'fieldSet'->>'HorizIrrad')::numeric as "HorizIrrad"
from the_data
cross join jsonb_array_elements(json_col->'values')

time	EnvTemperature	HorizIrrad
2021-08-02 11:00:00	7.0	632.0
2021-08-02 12:00:00	10.0	884.0

SELECT 2