Running the node in regtest and generating an invoice returns a lntb... bolt11 invoice (testnet), but according to bitcoin/bitcoin#12314 it should return lnbcrt...

c-lightning already returns an lnbcrt... invoice in regtest, so now it not possible to pay invoices between the two implementations. (both in regtest mode)

See other issue for more details: ElementsProject/lightning#1241

Maybe also clarify in https://github.com/lightningnetwork/lightning-rfc/blob/master/11-payment-encoding.md#human-readable-part