When the socket is not connected to other nodes, the script can be read into its variable. Everything is fine.
MyObjName = bpy.data.node_groups["MyGNStrings"].nodes["Group output"].inputs[1].default_value
The value object_test is written in variable MyObjName:

But when I connect this socket to other sockets, its value is no longer readable by the script:
For each animation frame, I need to get my own object index, which will be contained in this socket.
