Water reflecting abyss?

[DeAngelo]

OK, you know that weird trailing effect you get if at any point in your level the player can see the "abyss" (meaning the nothingness at the edge of a map)

Well I'm getting that effect on my water for some reason. I can't figure out why other than the water not reflecting the ceiling and instead reflecting the abyss. I tried putting black planes outside my level and that fixes it but it oddly causes my framerate to freeze up to about 1 frame per 10 seconds and cause objects to randomly fly around. Freaky. Anyway here's a screenshot.

Spoiler below!

[Romulator]

Have you tried enabling a skybox in your Level Editor, even just as a color? If you cannot see the outside from where you are, which it looks that way on your image, why not try just making it black?

[DeAngelo]

That got rid of the trailing, but it still leaves a weird box in the water that immediately vanishes once I get close to it.

Spoiler below!

Edit: I just changed the water texture from Morgue to ArchiveCellar and it looks fine now. I guess the Morgue water texture is just borked somehow. Thanks

[PutraenusAlivius]

It seems like some walls/ceillings forbid reflection (It means that it doesn't allow for it to be reflected/is invisible when reflected.)

[Acies]

That got rid of the trailing, but it still leaves a weird box in the water that immediately vanishes once I get close to it.

Spoiler below!

Edit: I just changed the water texture from Morgue to ArchiveCellar and it looks fine now. I guess the Morgue water texture is just borked somehow. Thanks

It can have to do with cubemaps and texture size on the plane - you could try creating a copy of that water material, but without a cubemap.