[BUG] error merge

[quocn9043]

Describe the bug
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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Info (please complete the following information):

• Server version: 1.20.4 pufferfish
• Client version: optifine 1.20.4
• Plugin version: 1.1.8

Additional context
Hello, can I ask how to whitelist some blocks or items so they don't merge? Because when it is combined, some sugarcane, watermelon, and cactus farming machines do not work, causing it to fail