Drop down ability button, i.e. rogue poisons, hunter pets, warlock pets, does not work once I put it on my action bar. Works fine in the spellbook.
It will work fine if you are using the default action bars, but not if you are using action bar addons like Bartender4 or ElvUI. The addon devs are aware, and say it’s a Blizzard issue, however, and there is a statement at the top of the Bartender4 page with this information (though not sure about other addons).
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