Just in case someone is wondering instead of joining the duplicates you can just instance the collection with geometry nodes as well. The only problem with this that you have to apply the geometry node modifier, then go to the Object Data Properties tab there search for the Attributes section. Select the UV map attribute and clock on the down arrow and convert it to UV Map. Then the textures are going to appear correctly.
Here is the geometry node setup for this:
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Yes, but the strength of Geo nodes is that you keep the nodes.
There are other nodes to work with UV-map (generations).
It’s more complex knowledge of geo node.