Persistent object cache enabled test fails, despite having object caching

I have Redis object caching configured and it works, but I get 0/Failed for the first Object cache test. However, I get 10 for the write, read and mixed usage tests.

Looking at the code, it seems like this test relies on checking

wp_cache_get(“is_this_persistent”, “wpbenchmark”);

However, there is no wp_cache_set for this key anywhere in the code…