diff --git a/test/functional/feature_block_v4.py b/test/functional/feature_block_v4.py
index 0f5ace0cd0..f803cb39e1 100755
--- a/test/functional/feature_block_v4.py
+++ b/test/functional/feature_block_v4.py
@@ -6,11 +6,11 @@
 
 from test_framework.blocktools import create_coinbase, create_block, create_transaction
 from test_framework.messages import msg_block
-from test_framework.mininode import mininode_lock, P2PInterface
+from test_framework.mininode import P2PInterface
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, wait_until
+from test_framework.util import assert_equal
 
-from feature_cltv import cltv_validate, REJECT_OBSOLETE
+from feature_cltv import cltv_validate
 
 class BlockV4Test(BitcoinTestFramework):
     def set_test_params(self):
@@ -32,19 +32,13 @@ class BlockV4Test(BitcoinTestFramework):
         block.nVersion = 3
         block.solve()
 
-        # Send it to the node
-        self.nodes[0].p2p.send_and_ping(msg_block(block))
-
         # The best block should not have changed, because...
         assert_equal(self.nodes[0].getbestblockhash(), tip)
 
         # ... we rejected it because it is v3
-        wait_until(lambda: "reject" in self.nodes[0].p2p.last_message.keys(), lock=mininode_lock)
-        with mininode_lock:
-            assert_equal(self.nodes[0].p2p.last_message["reject"].code, REJECT_OBSOLETE)
-            assert_equal(self.nodes[0].p2p.last_message["reject"].reason, b'bad-version(0x00000003)')
-            assert_equal(self.nodes[0].p2p.last_message["reject"].data, block.sha256)
-            del self.nodes[0].p2p.last_message["reject"]
+        with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000003)'.format(block.hash)]):
+            # Send it to the node
+            self.nodes[0].p2p.send_and_ping(msg_block(block))
 
         self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
 
diff --git a/test/functional/feature_mandatory_coinbase.py b/test/functional/feature_mandatory_coinbase.py
index b942afb9eb..64f76b04cf 100755
--- a/test/functional/feature_mandatory_coinbase.py
+++ b/test/functional/feature_mandatory_coinbase.py
@@ -64,10 +64,11 @@ class MandatoryCoinbaseTest(BitcoinTestFramework):
         block.proof = CProof(bytearray.fromhex('51'))
         block.vtx = [coinbase_tx]
         block.block_height = int(tmpl["height"])
+        block.hashMerkleRoot = block.calc_merkle_root()
 
         self.log.info("getblocktemplate: Test block on both nodes")
-        assert_equal(node0.submitblock(b2x(block.serialize())), 'invalid')
         assert_template(node1, block, None)
+        assert_template(node0, block, 'bad-coinbase-txos')
 
         self.log.info("getblocktemplate: Test non-subsidy block on both nodes")
         # Without block reward anything goes, this allows commitment outputs like segwit
diff --git a/test/functional/mining_basic.py b/test/functional/mining_basic.py
index 1d0f7e7b01..fce41b3ca8 100755
--- a/test/functional/mining_basic.py
+++ b/test/functional/mining_basic.py
@@ -156,8 +156,6 @@ class MiningTest(BitcoinTestFramework):
         self.log.info('submitheader tests')
         assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='xx' * TX_COUNT_OFFSET))
         assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='ff' * (TX_COUNT_OFFSET-2)))
-        import pdb
-        pdb.set_trace()
         assert_raises_rpc_error(-25, 'Must submit previous header', lambda: node.submitheader(hexdata=super(CBlock, bad_block).serialize().hex()))
 
         block.nTime += 1
diff --git a/test/functional/p2p_invalid_block.py b/test/functional/p2p_invalid_block.py
index b2bb2e1df9..da651d66bc 100755
--- a/test/functional/p2p_invalid_block.py
+++ b/test/functional/p2p_invalid_block.py
@@ -92,7 +92,7 @@ class InvalidBlockRequestTest(BitcoinTestFramework):
         block2_orig.hashMerkleRoot = block2_orig.calc_merkle_root()
         block2_orig.rehash()
         block2_orig.solve()
-        node.p2p.send_blocks_and_test([block2_orig], node, success=False, request_block=False, reject_reason=b'bad-txns-inputs-duplicate')
+        node.p2p.send_blocks_and_test([block2_orig], node, success=False, request_block=False, reject_reason='bad-txns-inputs-duplicate')
 
         self.log.info("Test very broken block.")
 
diff --git a/test/functional/test_framework/test_node.py b/test/functional/test_framework/test_node.py
index 85d96228fc..5af1f24261 100755
--- a/test/functional/test_framework/test_node.py
+++ b/test/functional/test_framework/test_node.py
@@ -250,7 +250,7 @@ class TestNode():
 
     @contextlib.contextmanager
     def assert_debug_log(self, expected_msgs):
-        debug_log = os.path.join(self.datadir, 'regtest', 'debug.log')
+        debug_log = os.path.join(self.datadir, 'regtest2', 'debug.log')
         with open(debug_log, encoding='utf-8') as dl:
             dl.seek(0, 2)
             prev_size = dl.tell()
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index c06f7109e6..117e5c3884 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -163,7 +163,6 @@ BASE_SCRIPTS = [
     'rpc_uptime.py',
     'wallet_resendwallettransactions.py',
     'wallet_fallbackfee.py',
-    'feature_minchainwork.py',
     'rpc_getblockstats.py',
     'p2p_fingerprint.py',
     'feature_uacomment.py',