[Bug]: Opening, closing and opening XObject entry duplicates properties

[gravityFlower]

When opening an entry (sub node) of a XObject, closing it and then opening it again dublicates the entries under this node

Expected:

• properties should not be duplicated by repeatedly openiong and closing nodes

How to reproduce:

• open pdf
• go to Root -> Pages, select (and extend) an entry from the Kids array
• go to Resources (dict), select sub note XObject (dict) and an entry
• click on the node
• close by clicking on it again
• open again by clicking on the node

The pdf was a pdf document wirth images embedded on each site as noly content.