Bug: Func_precipitation/rain particles are clipped on bottom quarter of screen

[koerismo]

Describe the bug

Particles produced by the func_precipitation brush entity disappear when entering the bottom quarter of the screen.

To Reproduce

1. Use func_precipitation with "Particle Rainstorm" selected in a map.
2. Enter map and look around.

Issue Map

N/A. A test map does not exist at this time.

Expected Behavior

Precipitation particles should appear normally.

Operating System

No response