There is no error or cancellation at calling grpc.DialContext below, it is just put on hold.
The mailbox is mailbox.terminal.lightning.today:443
https://github.com/lightninglabs/aperture/blob/master/lnc/lnc.go#L284-L286

By the way, this issue may be due to be re-use passphrase from multiple containers under development, because it worked generating new phrase per container. However, I don't know because I haven't received a response and seen any documentation prohibiting passphrase reuse.