the panels node_edit page combines node/node_edit/node_add contexts so that multiple fields are available.
In mini-panel There is not the same seamless option available.

There are several fields that take a node context (node:publishing) but in a mini-panel need either a node_edit or node_add context.

This means that I have to create a block with node + node_edit and another with node + node_add contexts.

I have not tested placing these mini-panels on the node_edit panel page yet. I don't know if the context will be even seen.