Describe the bug

Shadows of any vehicles of Flan's mod are not rendered if Optifine installed and shaders enabled

To Reproduce
Steps to reproduce the behaviour:

1. Install Flan's mod, some content packs and Optifine HD F5
2. Enable any shader
3. Shadows of vehicles are not rendered

Expected behaviour

Shadows of vehicles are rendered

Screenshots

Versions (please complete the following information)

• Forge: 14.23.5.2854
• Flan's Mod: 5.7.0-beta.5
• Optifine 1.12.2 HD U F5
• SEUS-Renewed v1.0.1
• Sildur's Enhanced Default v1.11

Additional context