In enigmatica 10, the red hologram showing a wrong block in a multiblock hologram when holding a wrench is missing. I noticed it was also missing for the statech 1.21.1 port. I looked into it and found it was related specifically, in my case, to kubejs loading a subfolder containing some pngs (attached).

This happens on a minimal instance of these mods (1.21.1, neoforge 21.1.200) and the kubejs assets folder:

• rhino-2101.2.7-build.77.jar
• emi-1.1.22+1.21.1+neoforge.jar
• guideme-21.1.14.jar
• kubejs-neoforge-2101.7.1-build.181.jar
• Modern-Industrialization-2.3.10.jar

Kubejs folder: kubejs.zip

I'm actually able to reproduce this without KubeJS but I have a lot more mods in my environment. I'll need to do some more testing to see if I can pin down what mod is causing this in my current instance.