Yep, could be smth like that but not exactly that one - that's vin rule and payee multisig goes to vout.Possible suspect: https://github.com/dashpay/dash/blob/v0.12.0.x/src/main.cpp#L947-L952
Code:if (tx.IsCoinBase()) { if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100) return state.DoS(100, error("CheckTransaction() : coinbase script size"), REJECT_INVALID, "bad-cb-length"); }