Hi Gabriel, This error usually happens when you're returning non-persistable entities directly from a microflow to a list view without proper context.
Solution:
Wrap the list view inside a data view that receives a persistable entity (e.g., page parameter or helper object).
Associate the non-persistable entities to that persistable entity.
In your microflow, return the associated list via that context, not directly.
Also, do a clean deployment:
Stop app, delete deployment folder, restart the app.
Clear browser cache.
If you're using a custom or outdated widget, update or replace it.
I hope this one helps you:)