Does a lender have the right to withhold funds from the purchaser of a home regarding the construction of deck?

Question Details:

Purchase agreement states the seller to provide labor for deck, buyer (us) to provide materials. Appraisal does not note any hypothetical situations, and deck was not included in appraisal, appraised to loan amount plus 20% down. Seller has since provided us with money in lieu of labor, which is fine. We have purchased deck materials, provided receipts but lender will not release escrow until we pay to have additional appraisal of deck. Can the lender continue to legally hold this and require payment? Not sure why this money was ever withheld from us and not the seller.

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