I have some points for guide you.
1. AFAIK, your automatically record creation rules or some workflows are not automatically transition to Power Automate.
2. All of UCI trainsition and 2020 wave 1 and transition to Power Automate are different topics.
# UCI transition
cloudblogs.microsoft.com/.../
This is UX change event. e.g. layout, look and feel...
# 2020 wave 1
docs.microsoft.com/.../
# transition to Power Automate
This is gradual switching of legacy product to new products.