I experienced the same thing, working on an old project in the latest version of Construct cause the opacity parameter not working.
Viewing post in Construct 3 3DObject Plugin - SDK V1 only comments
here the sample, try to open c3p in R440.2 and than try open in R449
https://drive.google.com/file/d/16rOr9gWgFQnNxtxAPqTpxvEFI96zg75G/view?usp=shari...
Thanks for the example, please try 2-77-3:
https://kindeyegames.itch.io/c3-3dobject-alpha/devlog/993531/fix-opacity-and-col...