For readers of this topic who aren't aware, I am talking with Byte GameMaker Magazin on Discord and behind the scenes I have been able to reproduce the bug he mentioned, though it is confirmed to be a Windows-only bug. Meaning it will not crash on macOS or Linux for anyone, making the extension/demo still valid/useful way more than it would be if it crashed on all platforms, (which it doesn't). Most people use Windows in the marketshare though, so this bug is considered crucial and I am making it a priority to fix it. I might get help from the boost process lead developer when he is less busy, if I am unable to figure this one out by myself.