Since updating to Minecraft 1.21.4 and all the mods as well, I experience an issue with litematica. Blocks are not rendered with texture anymore. Some items like the pot or banner still appear. Here are the versions I currently use:

• FABRIC 0.16.9
• Fabric API 0.113.0
• Litematica Fabric 0.21.0
• MaLiLib Fabric 0.23.0
• Sodium Fabric 0.6.6
• Iris Shaders Fabric 1.8.5
• Complementary Shaders - Reimagined r5.3

I've found some issues while using this mods/shaders and with other shaders too

• Hologram Blocks don't appear
• Borders appear, but opacity filter doesn't work (full transparent or full opaque)
• Somehow, blocks are not rendered, but shadows do

Your shaders could be the reason for that, you should try turning off shaders.

Yes, when I disable the shader it shows the texture, but is this not still an issue on litematica's side? This shows that it is not compatible with shaders or am I wrong and it's actually a problem on the shaders side?

Did you ever find a fix for this, i am also having the same issue, tried a variety of shaders and none seem to be compatible

The latest 1.21.4 mod release 0.21.2 has a fix for shader/Iris compatibility: https://modrinth.com/mod/litematica/version/0.21.2