[bug] Connections page with existing connections breaks when encryption key is changed

- https://share.cleanshot.com/0VDwtwKq

Open the linked screenshot and inspect the Connections page with existing connections, then reproduce the failure after changing the encryption key. Trace the page's connection and encryption handling to identify the affected entry point; done means the page remains usable and existing connections are handled correctly after the key change, with a regression test if the project provides one.

Written by the indexing model from the issue text.