These are third party addons, we cannot test if third party addons will continue to work. That is the responsibility of each individual addon author to make sure their stuff works with the new release.
They can grab the beta version and check it, make any necessary adjustments to their addons and hopefully have it ready before the client goes stable. That way there is minimal impact to their users and most of them wouldn't notice. Well that is if they update their stuff...
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