For example, there are 2 server nodes in the cluster. Also, there is a replicated cache with a configured cache store. If we try loading entry through IgniteRepository#findById then it can be fetched from the cachestore successfully. But if we check the partitions for that entry we will find only one primary and there is no backup in the cluster. The reproducer is attached SpringRepositoryTest.java CacheRepository.java .
As a workaround it is possible to use IgniteCache#get instead of IgniteRepository#findById.