This just happened to me. And I will enclose two screenshots. It was on the ultraxion fight and i believe it has something to do with the "Fading Light" button or the ExtraActionButton, because as soon as that should appear, bam, no more buttons. It would also explain while the first poster only experienced on certain platforms. One screenshot is right before the fight and the other is right as it is about to begin.
Hope this helps
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