Fix use_item packet format for Minecraft 1.21+ compatibility#3743

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Copilot wants to merge 9 commits intomasterfrom

copilot/fix-3742

Commits on Sep 20, 2025

Initial plan
Copilot
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Add test and fix for use_item packet format in 1.21+

Copilot
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rom1504
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Refine use_item packet fix for 1.21+ compatibility

Copilot
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rom1504
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Fix use_item packet format in place_entity.js and enhance test

Copilot
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rom1504
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Add test reproducing use_item packet format issue in 1.21+

Copilot
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rom1504
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Implement fix for use_item packet format in 1.21+

Copilot
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rom1504
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Add minimal test reproducing activateItem issue

Copilot
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rom1504
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Fix use_item packet format using support feature

Copilot
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rom1504
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Improve activateItem test to check server-side effects and add fallback for missing feature flag

Copilot
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rom1504
committed