Retain State on Slide Revisit and animated gifs

[Cp 2019 Mac]
I have an animated gif with a custom state Visited, which is essentially the same gif in a different color. An advanced action on a button in the same slide changes the state of the gif to Visited, then opens a URL in a new window. When I preview my project (Preview > Live Preview on Devices) the advanced action works as expected, but if I navigate away from the slide and return to it, the gif has returned to its Normal state, even though its Retain State on Slide Revisit property is selected. On slides where my image states are comprised of pngs, Retain State on Slide Revisit is working as expected. Am I missing something? Can anyone confirm this behavior with animated gifs?