FCR prices & quantities are blended on 4h block transitions

[JelmerSTE]

See here a dump of FCR price and volume data, acquired through:
EntsoePandasClient.query_contracted_reserve_prices_procured_capacity(country_code='NL',
start=t_start, end=t_end,
process_type = 'A52',
type_marketagreement_type ='A01')

entsoe-py version 0.7.8

Dump:
,Symmetric Prices,Symmetric Quantity
2025-12-05 00:00:00+01:00,9.5,39.0
2025-12-05 00:15:00+01:00,9.5,39.0
2025-12-05 00:30:00+01:00,9.5,39.0
2025-12-05 00:45:00+01:00,9.5,39.0
2025-12-05 01:00:00+01:00,9.5,39.0
2025-12-05 01:15:00+01:00,9.5,39.0
2025-12-05 01:30:00+01:00,9.5,39.0
2025-12-05 01:45:00+01:00,9.5,39.0
2025-12-05 02:00:00+01:00,9.5,39.0
2025-12-05 02:15:00+01:00,9.5,39.0
2025-12-05 02:30:00+01:00,9.5,39.0
2025-12-05 02:45:00+01:00,9.5,39.0
2025-12-05 03:00:00+01:00,9.5,39.0
2025-12-05 03:15:00+01:00,9.5,39.0
2025-12-05 03:30:00+01:00,9.5,39.0
2025-12-05 03:45:00+01:00,9.5,39.0
2025-12-05 04:00:00+01:00,9.9375,43.5 << wrong!
2025-12-05 04:15:00+01:00,10.375,48.0
2025-12-05 04:30:00+01:00,10.375,48.0
2025-12-05 04:45:00+01:00,10.375,48.0
2025-12-05 05:00:00+01:00,10.375,48.0
2025-12-05 05:15:00+01:00,10.375,48.0
2025-12-05 05:30:00+01:00,10.375,48.0
2025-12-05 05:45:00+01:00,10.375,48.0
2025-12-05 06:00:00+01:00,10.375,48.0
2025-12-05 06:15:00+01:00,10.375,48.0
2025-12-05 06:30:00+01:00,10.375,48.0
2025-12-05 06:45:00+01:00,10.375,48.0
2025-12-05 07:00:00+01:00,10.375,48.0
2025-12-05 07:15:00+01:00,10.375,48.0
2025-12-05 07:30:00+01:00,10.375,48.0
2025-12-05 07:45:00+01:00,10.375,48.0
2025-12-05 08:00:00+01:00,10.125,47.5 << wrong!
2025-12-05 08:15:00+01:00,9.875,47.0
2025-12-05 08:30:00+01:00,9.875,47.0
2025-12-05 08:45:00+01:00,9.875,47.0
2025-12-05 09:00:00+01:00,9.875,47.0
2025-12-05 09:15:00+01:00,9.875,47.0
2025-12-05 09:30:00+01:00,9.875,47.0
2025-12-05 09:45:00+01:00,9.875,47.0
2025-12-05 10:00:00+01:00,9.875,47.0
2025-12-05 10:15:00+01:00,9.875,47.0
2025-12-05 10:30:00+01:00,9.875,47.0
2025-12-05 10:45:00+01:00,9.875,47.0
2025-12-05 11:00:00+01:00,9.875,47.0
2025-12-05 11:15:00+01:00,9.875,47.0
2025-12-05 11:30:00+01:00,9.875,47.0
2025-12-05 11:45:00+01:00,9.875,47.0
2025-12-05 12:00:00+01:00,10.5625,51.0 << wrong!
2025-12-05 12:15:00+01:00,11.25,55.0
2025-12-05 12:30:00+01:00,11.25,55.0
2025-12-05 12:45:00+01:00,11.25,55.0

On the beginning of each 4h block, the prices and volumes are blended between prices/volumes before and after.