Please try
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and let me know if your issue persists. If so, please open an issue on Github and attach your extensions.log file in playnite.
If you are using the old debug loading method, please delete it from the developer settings before loading the alpha build. I've since resolved packing issues due to rewriting some problematic code and now release the extension properly via a .pext file.
Version 3.0.0 isn't completely ready for production, which is why its labeled as a pre-release. I intend to add all the features I have planned & refactor the codebase before fully releasing 3.0.0. For the time being however, it should work perfectly fine, albeit a bit rough around the edges.