Severe BUG: Point Light Shadows do not work correctly (works in 2017.1, but not 2017.4)

I'm working on getting some images/video as proof, but the shadows from point lights are VERY broken in Unity 2017.4 (f10). We're not the only ones seeing it, as this thread calls it "anti-shadows":

http://zh.esotericsoftware.com/forum/shadows-with-point-light-appear-as-ANTI-shadows-7026

We don't have many point lights with shadows in Overload, but many (user-created) custom levels do, and in 2017.4 (but not 2017.1), their lighting is severely messed up because of the issue. I will post back soon with visual proof, but I'm certain this is a Unity bug. Spot lights and directional lights with shadows work fine, as do all non-shadow-casting lights.

Thanks,
Luke Schneider

 

Here is the video of it occuring:

You can clearly see that instead of casting shadows, it creates an inverted shadow of sorts.

Here's some screenshots...



First a spot light working fine (above).


Then changed to a point light (above).



Then messing with some settings of the light (near plane).

 

Looks like it's caused by the shadow softener shader we're using (been using since 2014), but the asset is no longer supported

https://forum.unity.com/threads/shadow-softener-official-thread.200024/page-11

 

You might want to try this asset then, which is actively supported:
https://assetstore.unity.com/packages/vfx/shaders/next-gen-soft-shadows-79454