How do Bodhisattva vow takers avoid stream entry?

According to the suttas in SN13 , a stream enterer (or stream winner or sotapanna ) only has at most, seven remaining lifetimes, before they are permanently freed from suffering. On the other hand, takers of the Mahayana Bodhisattva vow , would forego enlightenment for a very long time (apparently aeons), till they complete the full Bodhisattva training (which I presume is the development of paramitas and the attainment of bhumis ). However, this implies that they need to avoid stream entry, which could cause them to become released from suffering in seven lifetimes at most. So, how do they avoid stream entry? Do they avoid it by avoiding the practice of insight meditation (vipassana ) perhaps?