Estimated readings after Smart Meter (SMETS2) fitted

We had a smart meter fitted last month. Our latest bill shows the final reading for the old meter, but gives an estimated reading for the end of month. We had thought that the main benefit of a smart meter was that it is read automatically. Is this lack of automatic reading to be expected?
As the estimate (on 8th July) is higher that the current reading (29th July) I guess we should continue to submit manual readings.
Is an estimated reading after fitting SMETS2 a regularly encountered transitional problem, or is this an unusual fault which needs to be followed up, if so where should it be reported?