Minecraft v1.15.2
Forge v31.2.31
CTM v1.1.0.10
ZYCraft v0.0.3

Most block underlays are not displaying properly, both when placed and in the inventory, as seen in the screenshot. And aluminium ore is using the old stone texture.

Can you post your log file (latest.log) on pastebin.com?

Yeah, I thought that might be the case. Optifine was the first mod I tested to find the incompat.

I forgot to mention that this is on a server. I also don't see anything in the log, but here it is:
https://gist.github.com/WenXin20/7dacfda88562e9ab013d6fd9449463cc
I also noticed that Aluminium is missing the forge tag forge:ingots/aluminium

Here is the client log, this has some errors from the mod:
https://gist.github.com/WenXin20/8bcac5ffc69c25431689da436c95e087

Can you try to run a modpack only with Forge, CTM and ZYCraft and see if the problem still exist? Because for some reason it works just fine on my end...

Looks like this is being caused by the preview version of Optifine

Aluminium Ore texture will be fixed in the next release.
As for ingots/aluminium tag, right now it's intended because my Aluminium is not like ingot and it will be strange if i you will be able to craft Aluminium Block's from my mod using ingots from other tech-mod. And craft metal-like aluminium storage blocks from other tech-mod using my Aluminium. Maybe i will change that in the future.

Were you able to replicate the bug with Optifine?

I will try tomorrow. But actually this is not surprising, Optifine is famous for breaking other mods (especially rendering) and I can not do anything about it.

Yeah, tested with Optifine and I get missing textures on my blocks, so nothing I can do about this. I will add a warning on the Curseforge page.
Also, Aluminium Ore texture was fixed, update mod to 0.0.4.

@WenXin20 I fixed Optifine incompatibility in 0.0.6.

Oh, thanks!