You’ll probably have to pause the cutscene until all of the lego parts have loaded in through some sort of method, such as WaitForChild and then just playing the cutscene once it exists.
Im not very good a t scripting i used the Codes Otaku Cutscene - Roblox
it automaticly made the script. im kinda new, I scripted the stuff in the background but thats all I know how to do. i added local Legoman = workspace:WaitForChild(“Legoman”) to the local script
If you want to manage your game more efficiently (and fun) my advice is to start learning to script a little.
I would say disabling the cutscene script and having another script to wait for instances to load then that script enable cutscene script would solve it.