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From the help center:
All items not set to auto-request on your Wish List will be "hidden" from the system when a Hold is in effect.
If you place a book on your Wish List while a Hold is in effect, that Wish List item will not be hidden by the Hold.
Think of your non-auto-requested Wish List items as a birthday present. Whatever is on your Wish List will be "wrapped up" by the Hold when it goes into effect, and the birthday present will be "hidden" from view by the wrapping; anything placed on the birthday present after it has been wrapped (any newly Wishlisted books) will not be hidden from view. This analogy also applies to how the Hold "hides" items on your Bookshelf.
Auto-request items are not hidden by the Hold; however, they will be treated like they are hidden if you have no credits at the time a copy of the book becomes available when your account is on Hold.