I am not sure if I can follow you but this bug affects both “show context” and “show parent” button on broken instances.
There is a chain link icon and a fedi icon, both of which have “show context” as mouseover text. The difference is that the chain link shows the local copy, and the fedi icon links to the source node (in the case of your msg, feddit.de). Being able to view it on the originating node also means using the web client of that other node.