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HACS 2.0 - The best way to share community-made projects just got better - Home Assistant
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Either they A/B tested this or they accidentally released some of it early because I got all of that new UI stuff a few months ago, complete with addons appearing in the HA updates section. A few days later, just as I'd got used the change, it disappeared!
At least I now know I wasn't going mad.
its been on the experimental branch for a while now
I have had this for a while, I believe I have enabled experimental features on it.
Yes of course! I enabled experimental features to use a template add-on, but I later removed it and turned the option off.
Maybe you installed a development/beta branch or something?