Skywave fields give a blank/censored like texture when it gets night.
Also trees change to extremely bright colours when this happens.
Haven't made screenshots yet, will do so if you need it.

Yea. screenshots please. also be sure to test without optifine or related.

Information never provided. Reopen the issue once you want to add more information..

haven't been able to find a new astral field (they are extremly difficult to find for some reason)
perhaps an idea to make a spawn command for the field.
I'll keep searching and when i encounter one I'll let you know if it still exists with provided screenshot. I have no optifine or other similar mods installed.