vmo wrote:EDIT: I uploaded the video.
Thank you for the video!

That's not a bug, like for all the others complaining about fixtures disappearing, you are mixing up modifying the template with modifying the actual trim. Like I wrote in the opening post:
Fixtures Disappearing?The fixtures disappearing is not a bug IF they are still on the "Model" when you go back there. The game works differently now and we need to better explain that, because with the saving issues in the last big update we taught people to first finish building the car and then designing it. So here is how it is supposed to work, and some situations and their intended outcomes.
How it works:The first 3 tabs in the car design are for the model, marked by the little model car symbol. Here you can make the
template to be used for all trims you build
after creating that template. Changing the template after creating any trim only affects trims you build after the modification, not the ones already built.
Good procedure:Make template design on first fixture tab, use save button to save your design progress (the only thing that does not auto-save until you select list items or move sliders), once done move to second fixture tab and modify the fixtures for this trim only.
Not a bug:Leave 1st fixture tab (template) empty, leave 2nd fixture tab (trim) empty, make rest of car, come back to 1st fixture tab and design the car, go to 1nd fixture tab and ALL FIXTURES ARE GONE. Going back to the 1st fixture tab, they are all there though.