New feature in Storyline 360: Interactive 360° images

I've been creating an environmental ed game prototype in Storyline utilizing 360° images I've taken on the trails at a local county park. I've placed hotspots on the trails so the users can explore the park by having the 360° images placed on separate layers with "show layer" triggers on each hotspot with "free navigation" option.

Problem is, when the user returns to a slide layer they've already navigated from, the hotspots they've previously clicked on briefly become visible for a half-second, even though the "reveal hotspots" effect has been turned off for every single one. And it's only the hotspots they've selected previously; the ones they haven't touched remain hidden.

The brief flashing of the hotspots is a major distraction. How can I keep my hotspots completely hidden, with only a change in the cursor to signal the user it's something to select? Thanks!