Even that doesn't get me to connect to MobileData w/VPN. I've been no-VPN since getting my 6a onto Graphene. WiFI+VPN works fine. The workaround did work, briefly (5min or so) right when A13 was released, but no longer.
TMobile (40000000018.7) + Mullvad + 6a + GOS 1016build
... AlwaysOnVPN set to NO (so block-connections option is greyed-out/ isn't an option)
... sure would like to find that the upstream issue were trackable. Being on mobile data is > half of my use, and I don't take measures like running Graphene to walk around without a VPN.