Such a summons is considered to have been improperly served.
You cannot obtain a document from the court that would automatically stop mobilization during the trial, because the court does not provide such protection from mobilization, but rather reviews the legality of the CCC's decision. Moving around the city during the trial does not guarantee protection from mobilization unless the court's decision is passed or declared unlawful. You can carry court documents with you to prove that the trial is ongoing.
Publicly useful work - types of temporary labor activity of able-bodied persons under martial law, which are carried out to perform work of a defensive nature, eliminate emergencies of a technogenic, natural and military nature that arose during martial law, and their consequences, meet the needs of the Armed Forces, other military formations and civil defense forces, ensure the functioning of the national economy and the system of ensuring the vital activity of the population, and also cannot be related to entrepreneurship or other activities aimed at making a profit, and which include work and services that do not require, as a rule, special professional training.
Able-bodied persons, including persons not subject to conscription for military service, who, due to age and health, have no restrictions on work under martial law (except for able-bodied persons involved in work in the defense sector and in the sphere of ensuring the vital activity of the population and reserved for enterprises for the period of mobilization and wartime for the purpose of performing work of a defense nature), are involved in socially useful work, namely:
unemployed and other unemployed persons;
employees of enterprises operating under martial law (in agreement with their managers), who are not involved in the implementation of mobilization tasks (orders) and are not included in the composition of non-staff (non-military) civil defense formations, - in the order of transfer;
persons employed in personal farming;
university students, pupils and trainees of vocational and technical educational institutions;
persons who provide for themselves through independent work.