To reproduce:
1. Open attached project;
2. Open "test" scene (you'll see 3 game objects: Cube references a depth render texture in its material; Cube(1) is a default cube; Quad is for debugging, it paints the depth texture all the time);
3. Make sure "Cube" has "MoveCube" script attached and Speed (f.e. 2) and Duration (f.e. 5) values set;
4. Enter Play mode;
5. Compare results between DX11 and OpenGL 4.5, also check differences with the Frame Debugger.

Notes:
-when running the scene, the script will also draw the depth texture on screen by OnRenderImage();

Expected result: objects don't disappear from the screen.
Actual result: when "Cube" moves far enough from the Camera, the screen becomes black.

Reproduces only with DX11, doesn't reproduce with OpenGL 4.5.

Reproduced on versions: 2017.1.3p2, 2017.2.2f1, 2017.3.1p3, 2018.1.0b10, 2018.2.0a3.