The new experience app is delegating all the casting-related functionality to an external code library which specializes in this stuff, The former app used home-brewed code which relied much on the device’s inbuilt functionalities.
Hence it now needs to access this new *.claspws.tv domain to do its work.
(There is some work underway to resolve this dependency in future releases, so that you don’t have to grant this exception for all time.)
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