Reflexion will be End-of-life on March 31,2023. See Sophos Reflexion EoL FAQs to learn more.
Release Post: Sophos Firewall OS v19.0 MR2 is Now Available
Old v19.0 MR1 thread: Sophos Firewall: v19.0 MR1: Feedback and experiences
Keep in Mind: V19.5 GA cannot be "downgraded to V19.0 MR2".