Support fully public contracts

[lydiagarms]

Overview

Support fully public contracts.

Tasks

Describe the solution you'd like
First remove the error message for fully public contracts.
We get several zappify errors when we use fully public contracts, fix all these bugs and test the zapp to make sure it runs successfully.

Definition of done

When is this task complete?
Fully public contracts should be supported.

Links

Include relevant links here
These could be links to papers, articles or other issues this is linked to.