Uranium ore chunk is no longer obtainable from sieves. Obtainable within version 1.40 but not in 1.42.

What mods are you using? I'm seeing it just fine in 1.42 with Immersive Engineering installed.

Well I got the issue while playing atm9 to the sky modpack. I updated all the mods within the pack and once it updated ex deorum to 1.42 instead of 1.40, uranium chunks from sieves wasn't available. Going to 1.40 instead fixed it.

I just loaded ATM9 TTS on their latest version (1.1.2) and swapped out Ex Deorum 1.40 for 1.42. I still see that Uranium ore chunks drop from sifting crushed deepslate. Do you see something different?

I will do some testing tomorrow to try recreate the issue :)

Make sure to send log files, they might contain warnings relating to the pack configuration

So I just did some testing and I can't seem to recreate the issue for some odd reason. I could have been getting some weird interaction with different mods that were producing the issue but I'm really unsure. I checked different versions of ex deorum combined with fully updated versions of all the other mods but only thing I could think of would have been a possible issue with jei possibly. I'll be sure to keep you updated if I run into a similar issue again or I find a way to recreate it.