Yesterday Google announced on Tweet Handler that they have released a core algorithm update to resolve a previous bug in site indexing.
The reason they have said there is nothing to fix because the update is not generally about targeting specific kind of low quality of back link.
In a general way, these kinds of updates are about improving how Google understands search queries, improving how Google understands web pages and bringing both sides together to provide more relevant search results.
Google Search Liaison then linked to a tweet from October 11, 2018, which is called An Update about Updates. In it Google counsels that in broad core updates there is generally nothing to fix.
The real-time Penguin algorithm is a part of Google’s core algorithm. The Penguin algorithm deals with links.There has been no official comment on whether the Penguin algorithm is a part of the June 2019 Core Algorithm Update.