The bug
Once you open the recipe book, the 4th recipe (sometimes 3rd, it's depend on where the mouse stays when the Recipe Book isn't open) would be selected automatically.
How to reproduce
1. Make sure you got at least 4 recipe
2. Open Recipe Book on Crafting Table
Thank you for your report!
We're tracking this issue in MC-259107, so this ticket is being resolved and linked as a duplicate.
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