date drivers are activated without corresponding additional state at the end of an estimation
This issue is linked to the following topic in the forum : https://forum.orekit.org/t/issue-with-maneuver-date-estimation-propagator/2424.
to reproduce the issue you can try to retrieve the propagator at the end of the maneuver-estimation tutorial :
Propagator[] estimatedPropagators = estimator.estimate();
finish(estimatedPropagators);
Orbit estimated = estimatedPropagators[0].getInitialState().getOrbit();
estimatedPropagators[0].propagate(estimated.getDate().shiftedBy(12 * 3600));
The following error should occur :
org.orekit.errors.OrekitException: unknown additional state "org.orekit.estimation.leastsquares.BatchLSModel-derivatives"
turnarounds have been found on the forum.