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Results: Portal 2 was unmounted from Garry's Mod and Garry's Mod was reset to ensure nothing would be left over from Portal 2, the asset's materials still function fine on my end, so my theory is still the only possibility at the moment, or the addon installed incorrectly.
I would first uninstall the addon and run menu_cleanupgmas then close Gmod, install the addon again, wait for cloud sync to be fully complete, then start Gmod up again and see if the issue has been resolved.