I've had the same, also with a SMETS1 Electricity meter:
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Like you, my daily electricity readings are available in the Octopus app.
I'm not sure how much longer Octopus are going to (fully) support the SMETS1 smart meters for. I haven't been able to collect my daily gas readings via Octopus for many months, although they seem to manage to take a reading automatically at the end of the month.
When I queried this with them I got this reply:
Whether this is related to the lack of electricity readings available for the recent saving sessions, I'm unsure,