Is the marriage contract valid if one of the two witnesses did not hear the wording of the contract, while there was another Muslim witness who did hear it?

The purpose of witnesses in marriage (nikah) is to hear the offer (ijab) and acceptance (qabul). Even if a witness is deaf but testifies to the written contract during the ceremony, their testimony is valid. Some scholars are of the view that publicizing and announcing the marriage (i'lan) suffices instead of specific witnessing, and is even stronger than it. Thus, if there is announcement, the prohibited aspect is negated. This is the choice of Shaykh al-Islam Ibn Taymiyyah. Shaykh al-Islam summarized this issue by saying: "There is no doubt that marriage with announcement is valid even if there are no two witnesses. As for marriage with concealment and witnessing: this is something to be considered. If both witnessing and announcement are present, there is no dispute regarding its validity. If both witnessing and announcement are absent: it is invalid according to the general consensus of scholars." The witness is not limited to whoever signed the contract; rather, everyone who attended the contract and is qualified to testify is a witness to it.