I have this White breaking texture for all blocks ive looked everywhere cant find a fix

i have the same issue, fingers crossed it can be fixed!

Looks like it is fixed on the newest version. I'm no longer seeing the issue. Thank you!

yes.
iris made a permanent change to the gbuffer program it renders at, to where the lightmap coordinates are always 1.0 (they are usually a gradient 1.0-0.0). that caused it to be full brightness wherever it was.

i had to reimplement it completely. i have done it closer to how mojang did it this time though, so it got upgraded.

thank you x0nk, as a swe myself (though don't know much about graphics) that sounds like a PITA. upgraded to latest and the fix is great!

this is a known issue im working to fix

i have the same issue

Its happening to me again on 21.1

if you are using v2.0.4 or older on the latest iris versions, it will always happen. use the in-development version if you want to have it fixed