The Recipe Book button in GUI screens can be focused using the Tab key; however, while the book is open, you cannot then focus the components in the Recipe Book such as the Search box and the Showing All/Showing Craftable button using the Tab key.
Steps to Reproduce:
Open a GUI with the recipe book (such as the crafting table or furnace)
Focus the Recipe Book by pressing Tab
Press Space to open the Recipe Book
Press tab again
Nothing happens
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We're tracking this issue in MC-183680, so this ticket is being resolved and linked as a duplicate.
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