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I cleared the cache and now the OpenVPN Client is gone, too (I only have OpenVPN Server under VPN in the menu). I can still get to the OpenVPN Client page by manually editing the URL to http://192.168.8.1/index#/vpnclient… which also works for getting to the WireGuard Client page at http://192.168.8.1/index#/wgclient, so it’s really just an issue of the menu.
… or maybe not. Trying to save a config for either Azire or Mullvad, I get the same “Warning: The API is unavailable!” popup.