If you run the milestone or snapshot versions of OH, you really need to watch the corresponding discussion thread: openHAB 4.0 Milestone discussion - #204 by icompas and the announcements: openHAB 4.0 Milestone Builds - #2 by Kai, and when something breaks be sure to check the latest docs too.
This is true all the time but even more critical when a new major version is in the works where breaking changes are allowed with abandon.
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