@tmccombie just to make this is the Preview bug thread. In 8.4.2 I found an issue with 3D Images in preview. The preview window is not respecting "visibility" when it comes to click actions. As in when you set and item to visibility=false it should not longer be clickable. This is not true in 8.4.2 preview. Even when an item is not visible it is still receiving clicks and worse it is blocking items behind it from receiving clicks.
Best example of this is to stack 2 3D images and given them each and right some JS to toggle visibility of the items. As in you click image1 and it is hidden and image2 is shown, then click 2 to hide it and show 1 again. If you have image 1 slightly on top it will also receive the click even when visibility=false and you can never click image2.
Needles to say but if you have been using visibility to control actions in an experience this breaks a lot of stuff as you have all these invisible items in the viewport that are clickable and blocking things behind them you might be trying to click on.
@jmikesell The issue you found in 8.4.2 is a known bug that was fixed in 8.4.3. This fix may have impacted model-items/3D assets' click event in preview. I'll keep you updated with our investigation on this 8.4.3 issue.