If two bows are damaged and combined to full health in a grindstone you can use the recipe for a dispenser in a crafting table as normal, but as soon as you click the recipe for a dispenser, it automatically changes to the dropper recipe and crafts a dropper if you do not add the bow manually, it crafts a dropper.
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We're tracking this issue in MC-129057, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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DuplicatesΒ MC-129057