There is a question which I would like to ask regarding this change, which will determine my follow up reply.
Continuing the discussion from Testlive Update 2.5 (24.06.2021) - The QoL and Bugfixing update!:
Will there still be any possible way to trigger a Purge along the southern banks of the River biome, such as by using a Convergance Trap? Or for that matter an Admin Setting to overide this change/exclusion?