diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index 9c8f0eca262..fcec2ecdbef 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -333,6 +333,8 @@ BASE_SCRIPTS = [
     'wallet_send.py --descriptors',
     'wallet_sendall.py --legacy-wallet',
     'wallet_sendall.py --descriptors',
+    'wallet_sendmany.py --descriptors',
+    'wallet_sendmany.py --legacy-wallet',
     'wallet_create_tx.py --descriptors',
     'wallet_inactive_hdchains.py --legacy-wallet',
     'wallet_spend_unconfirmed.py',
diff --git a/test/functional/wallet_fundrawtransaction.py b/test/functional/wallet_fundrawtransaction.py
index a331ba997e9..d886a59ac15 100755
--- a/test/functional/wallet_fundrawtransaction.py
+++ b/test/functional/wallet_fundrawtransaction.py
@@ -8,10 +8,13 @@
 from decimal import Decimal
 from itertools import product
 from math import ceil
+from test_framework.address import address_to_scriptpubkey
 
 from test_framework.descriptors import descsum_create
 from test_framework.messages import (
     COIN,
+    CTransaction,
+    CTxOut,
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
@@ -147,6 +150,34 @@ class RawTransactionsTest(BitcoinTestFramework):
         self.test_22670()
         self.test_feerate_rounding()
         self.test_input_confs_control()
+        self.test_duplicate_outputs()
+
+    def test_duplicate_outputs(self):
+        self.log.info("Test deserializing and funding a transaction with duplicate outputs")
+        self.nodes[1].createwallet("fundtx_duplicate_outputs")
+        w = self.nodes[1].get_wallet_rpc("fundtx_duplicate_outputs")
+
+        addr = w.getnewaddress(address_type="bech32")
+        self.nodes[0].sendtoaddress(addr, 5)
+        self.generate(self.nodes[0], 1)
+
+        address = self.nodes[0].getnewaddress("bech32")
+        tx = CTransaction()
+        tx.vin = []
+        tx.vout = [CTxOut(1 * COIN, bytearray(address_to_scriptpubkey(address)))] * 2
+        tx.nLockTime = 0
+        tx_hex = tx.serialize().hex()
+        res = w.fundrawtransaction(tx_hex, add_inputs=True)
+        signed_res = w.signrawtransactionwithwallet(res["hex"])
+        txid = w.sendrawtransaction(signed_res["hex"])
+        assert self.nodes[1].getrawtransaction(txid)
+
+        self.log.info("Test SFFO with duplicate outputs")
+
+        res_sffo = w.fundrawtransaction(tx_hex, add_inputs=True, subtractFeeFromOutputs=[0,1])
+        signed_res_sffo = w.signrawtransactionwithwallet(res_sffo["hex"])
+        txid_sffo = w.sendrawtransaction(signed_res_sffo["hex"])
+        assert self.nodes[1].getrawtransaction(txid_sffo)
 
     def test_change_position(self):
         """Ensure setting changePosition in fundraw with an exact match is handled properly."""
diff --git a/test/functional/wallet_sendmany.py b/test/functional/wallet_sendmany.py
new file mode 100755
index 00000000000..57519931433
--- /dev/null
+++ b/test/functional/wallet_sendmany.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+# Copyright (c) 2022 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test the sendmany RPC command."""
+
+from test_framework.test_framework import BitcoinTestFramework
+
+class SendmanyTest(BitcoinTestFramework):
+    # Setup and helpers
+    def add_options(self, parser):
+        self.add_wallet_options(parser)
+
+
+    def skip_test_if_missing_module(self):
+        self.skip_if_no_wallet()
+
+
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.setup_clean_chain = True
+
+    def test_sffo_repeated_address(self):
+        addr_1 = self.wallet.getnewaddress()
+        addr_2 = self.wallet.getnewaddress()
+        addr_3 = self.wallet.getnewaddress()
+
+        self.log.info("Test using duplicate address in SFFO argument")
+        self.def_wallet.sendmany(dummy='', amounts={addr_1: 1, addr_2: 1}, subtractfeefrom=[addr_1, addr_1, addr_1])
+        self.log.info("Test using address not present in tx.vout in SFFO argument")
+        self.def_wallet.sendmany(dummy='', amounts={addr_1: 1, addr_2: 1}, subtractfeefrom=[addr_3])
+
+    def run_test(self):
+        self.nodes[0].createwallet("activewallet")
+        self.wallet = self.nodes[0].get_wallet_rpc("activewallet")
+        self.def_wallet = self.nodes[0].get_wallet_rpc(self.default_wallet_name)
+        self.generate(self.nodes[0], 101)
+
+        self.test_sffo_repeated_address()
+
+
+if __name__ == '__main__':
+    SendmanyTest().main()