(Low Priority) Shadow Objects Are Culled Incorrectly

I am using a low sun angle to demonstrate:
https://youtu.be/LyRKPqhjs7k
(*The spheres in video are units)
Objects seem to be culled not by criteria of expectancy of the shadow in view, but it seems that it simply culls a shadow object if the object is off view (it may not be exactly so, but it _feels_ so).
(I have not looked into exact part of code yet.)

I am using a sun angle of 30, which is kind of common, and it already becomes a problem. The problem is that I cannot even configure how a piece of world looks in the shadow from objects because those shadows just disappear when I try to take a look. Most problematic are trees, because their shadows are big and visually important when zoomed in.

Same happens in BAR, but BAR maps usually use higher sun angles to be of a problem.

**Edit:**
Tagged this issue as _low priority_, as I found a temporary fix in form of moving Spring camera some distance back to reduce culling, separately from camera position for rendering, which works quite well so far. It is not a fix though, just a workaround the problem.

No file or test is named; start by reproducing the linked video with a low sun angle and tracing where shadow objects are culled relative to the camera. Done means off-screen objects retain the shadows expected in view, including large tree shadows, without moving the camera as a workaround.

Written by the indexing model from the issue text.