Same problem... Sipndump file pointed to us that something wrong with at linking stage. Experimentally we found the reason: YandexMapsMobile framework version 4.0.0-lite https://yandex.com/dev/maps/mapkit/. UnitTest stuck fixed by deleting YandexMapsMobile from project. Apple, however, what happened with dynamic linker under iOS 15 Sim?!

We found workaround! Two workarounds! First: In our case in TheApp has InternalProjectDependency which depends on external dependency that cause deadlock. We add Environment Variable DYLD_INSERT_LIBRARIES in to test buld scheme with value $(BUILT_PRODUCTS_DIR)/TheApp.app/Frameworks/InternalProjectDependency.framework/InternalProjectDependency Second: Just use TestPlans;)