Yeah Sony did that on purpose, I think from 3.60+ (maybe 3.56+ but I haven't tested 3.56) Sony removed the ability to handle "type:x-xmb/xmlpackagefolder" from the CEX explore_plugin.sprx. That's why you can't put install package files in the category_game.xml and have it work on 3.60+ using only retail sprx files.
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