Placing an enchantmnet table and bookshelves on top of snow doesn't create stronger enchantments

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Do you mean that snow layers can block an enchanting table from detecting bookshelves if placed between each other, resulting in not detecting those bookshelves?

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We're tracking this issue in MC-2474, so this ticket is being resolved and linked as a duplicate.

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Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki