Doesn't recover from "Temporary failure in name resolution"

I run riseup-vpn through a systemd user service unit, which starts it with riseup-vpn.launcher -select-gateway -start-vpn on.

When I reboot my machine, riseup-vpn can't connect automatically, and the only three line I see in the log are:

2019/05/07 09:22:39 firewall stop
2019/05/07 09:22:39 openvpn stop
2019/05/07 09:22:39 Error starting VPN:  Post https://api.black.riseup.net/1/config/eip-service.json: dial tcp: lookup api.black.riseup.net: Temporary failure in name resolution

I'm concerned that in this state it doesn't even block traffic (which is a different issue, but might also be related to my fw setup). It doesn't recover until I manually click Turn on, and then it works.

Please let it retry connecting until it succeeds.