Remove shuffle, since transactionbuilder shuffles automatically.
MODIFY
WalletWasabi/Models/ChaumianCoinJoin/CcjRound.cs
WalletWasabi/Models/ChaumianCoinJoin/CcjRound.cs
@@ -308,7 +308,6 @@ namespace WalletWasabi.Models.ChaumianCoinJoin
var builder = Network.CreateTransactionBuilder();
UnsignedCoinJoin = builder
.ContinueToBuild(transaction)
- .Shuffle()
.BuildTransaction(false);
// 8. Try optimize fees.

MODIFY
WalletWasabi/Services/WalletService.cs
WalletWasabi/Services/WalletService.cs
@@ -945,7 +945,6 @@ namespace WalletWasabi.Services
var tx = builder
.SetChange(changeScriptPubKey)
.SendFees(fee)
- .Shuffle()
.BuildTransaction(true);
TransactionPolicyError[] checkResults = builder.Check(tx, fee);

Remove shuffle, since transactionbuilder shuffles automatically.