Hi Vignesh107, We have had the same problem and in our case, when JavaScript objects arrive in the WKScriptMessage content instead of pure JSON format, the system was able to interpret these objects and obtain the JSON in previous version of iOS 26.2, but not in iOS 26.2. After stringify it, we obtain the string that iOS 26.2 is able to process.

Good morning, thank @DTS Engineer for your comment. The fact that we have been able to "solve" our problem does not mean that the logic of the system functions has changed since iOS 26.2. For this reason, we would like to know if this loss of functionality is going to be consolidated or if Apple will restore coverage in later versions of iOS. @DTS Engineer could you please give us an answer? Thanks.