** Issue description:when i open shader,TC tools will become a purple black block **

If crashed, link to crash report (use a site such as pastebin):

Versions:3.0.2.78

• Minecraft:1.16.5
• Forge: 36.1.3
• Mantle: 1.16.5-1.6.79
• Tinkers Construct:1.16.5-3.0.2.78

Confirm below that this issue is not covered on the roadmap or "Whats New?"

Can it be reproduced with just Tinkers Construct? If not, list the other mods required to reproduce the issue.

Version G8 of OptiFine fixes this issue

Yes, Optifine breaks most of Forge's rendering systems. No, there is nothing we can do about it. Report the issue to Optifine.