I have seen this issue many times but this time it was not fast render causing it. Any help?

Does it happen without sponge?

If you uninstall the pack (back it up first) and reinstall, does it fix it?

No, the log doesnt seem to show any errors relating to Astral

Its not a code error it's someone doing weird stuff with rendering, won't be in the logs. Do you recall what started it? May need to use binary method to determine what's triggering it.

Forgot to mention. Opening the Astral Tome does it but unlike the other issues here its not caused by optifine.
Edit: I was wrong, it is caused by optifine. But Fast Render doesn't cause it, and even when disabling everything it still breaks. I disabled optifine for now but damn i'm missing my shaders. Ill try some other builds of optifine,
Edit 2: Going back to optifine build C9 fixed it, haven't tried any more recent builds yet but i think ill stick with this one.
Edit 3: Nope. It was the resource pack doing it, using vanilla works fine but using Faithful 32 breaks it. Havent tried anything else.
Edit 4: All texture packs break it. Only way to avoid it is to disable optifine or the current resource pack.
Edit 5 (final): Several texture packs break it while others do not. I downloaded a diff version of Faithful 32 with modded textures as well but this time it didnt break. Some of my other resourcepacks also work as well, others dont. Not sure of the correlation.

Yeah, I tried removing sponge, removing optifine and replacing it with foamfix (which crashed my server on launch) and then saw this and tried turning off fast render. Nothing changed
Edit: If it helps at all, no icons or crosshair are replaced with the texture. Just all text in the game, menu, title screen, and chat.