Command & Conquer™ Tiberian Sun™ and Firestorm™

Command & Conquer™ Tiberian Sun™ and Firestorm™

Tiberian Sun game breaking bug, NOD "Destroy Mammoth Mk.II Prototype" mission can't proceed. Restarting or reloading doesn't fix it. Any help?
The white structure that needs to appear doesn't and the Mammoth keeps attacking this invisible spot, making it unable to progress. Restarting or reloading doesn't fix it. Any help?

https://i.redd.it/jp567f89d4pe1.jpeg