The Queued Ability Indicator has never gone away, but, for some unknown reason, it was make extremely subtle. On the default hotkey bars, the buttons appear to have a partial double-line gold border -- the inner line pulses when the action is queued, but this is nearly invisible unless you are looking for it.
This appears to be the MainHUD/Hotkey/Volume/Frame #/Slot elements in the UI, though I don't have enough experience yet with the UIBuilder to try changing it. Maube someone else will have better luck. Examining a clean install of the original (unpatched) UI might reveal the pieces need to get back a more visible indicator.
In-game you can get a partial "fix" by going to Options/User Interface/Game Colors/Queued Ability Indicator (near the bottom of the Game Colors list) and change it to something that contrasts better, such as magenta (full red & blue, no green).
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