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The core is quite buggy and outdated IME. It’s also not included in the Steam release you have to manually install it.
I hear RetroArch doesn’t have the best and latest emulation cores in general, though I don’t keep up closely enough to know why.
Retroarch often forks projects to modify them to be loadable cores. Upstream Dolphin isn’t interested in maintaining this. So it has to be manually updated every time.