Hi @Thomas_Meyers, thanks for the post and updates.
I checked the behavior and was able to observe that as you have reported, thanks for that.
I think it is related to the fade in MOVE transition and the interaction set to Scroll Into View.
Somehow the top offset is not recalculated for the tabs widget where normally that opens to the bottom of the tab menu, so the tab appears to be opening at that point prior to the images fading in.
I am helping to check further, in the meantime, if you remove the MOVE action in the Fadein timed animation, the tab should work ok, but the image will not move, only do an opacity change.
It could be that since the image is also set as the trigger element, like you say, if the image is still in view, that could be conflicting, you might also try to set another element as the trigger element, and target the image by class to see if the behavior changes.
When I have further info, I will share that info here.