Workaround…
If you really need to find out just search for the payee in your feed and their account info will be displayed below the reference 
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This makes sense, but why roll out the update in phases, hence breaking the functionality in the process?
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I’m guessing from what Kieran said that we’ll have a new way of seeing payee account information, and while they are developing it they need to hide the existing details. (Possibly a conflict on how the new system stores the details).