Problem with double doors to bathroom

We have a set of basic double doors (NOT bifold) leading to our master bath from the bedroom. The doors click closed (well, they used to!) with pieces of hardware on top that fit into divot hardware on the top frame. Suddenly one of the doors isn't catching and won't stay closed. Not sure if I need new hardware (something to build out that piece so it'll catch) or something else. Appreciate any help!
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