Hi, During and/or shortly after adding terrain to a world, the engine permanently freezes and has to be forced closed, losing all progress made.

I am using version 75 of Titan Engine on the KDE Neon operating system (based on Ubuntu LTS). I have tried both NVIDIA drivers 550 and 570, in X11 as well as Wayland.

yeah i have same issues ,
i did in two distributions ( ubuntu and opensuse ) i got same issues

I didn't have such problems.
I guess you could try build it in debug mode, and debug.

i will test it with another pc and i will tell you

now i have problem when i build any project it's say f private member

like this

you can check the output file

That is already fixed on GitHub source edition for some time.