Relative instance paths aren't propagated

[ImLucasBrown]

Describe the bug
A node who has relative instance paths, when instanced does not pass on that relative path, but instead passes on an absolute node path.

To Reproduce
Paste these nodes in and compare the instance paths of
/base/inst_tgt vs /base2/inst_tgt

Expected behavior
Relative paths should be preserved on proxy nodes.

Desktop (please complete the following information):

• Version API v0.8.1

Additional context

[
	{
	    "/base": {
	        "child_order": [
	            "inst_src",
	            "inst_tgt"
	        ]
	    }
	},
	{
	    "/base/inst_src": {
	        "attrs": {
	            "side": {
	                "type": "raw",
	                "value": "L"
	            }
	        },
	        "code": [
	            "${side}"
	        ]
	    }
	},
	{
	    "/base/inst_tgt": {
	        "instance": "../inst_src"
	    }
	},
	{
	    "/base2": {
	        "instance": "/base"
	    }
	}
]