We have a workflow in vRO called "Add Firewall Rules" or anything for that matter. In the input form we have set a validation to one of the fields to check if there is any sort of duplication when user enters a value.
This is achieved by using a validation action in the background
Now when we use this same workflow as a Day-2 action in a Custom Resource, we do not see the same validation pane while we edit request parameters
This is not a bug but an expected behavior, we still don't support external validations for day 2 actions