diff --git a/test/functional/feature_dbcrash.py b/test/functional/feature_dbcrash.py
index f227a06ebe0..ff014de0e0a 100755
--- a/test/functional/feature_dbcrash.py
+++ b/test/functional/feature_dbcrash.py
@@ -30,17 +30,27 @@ import http.client
 import random
 import time
 
-from test_framework.messages import COIN, COutPoint, CTransaction, CTxIn, CTxOut, ToHex
+from test_framework.messages import (
+    COIN,
+    COutPoint,
+    CTransaction,
+    CTxIn,
+    CTxOut,
+    ToHex,
+)
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, create_confirmed_utxos, hex_str_to_bytes
+from test_framework.util import (
+    assert_equal,
+    create_confirmed_utxos,
+    hex_str_to_bytes,
+)
 
 
 class ChainstateWriteCrashTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 4
         self.setup_clean_chain = False
-        # Need a bit of extra time for the nodes to start up for this test
-        self.rpc_timeout = 90
+        self.rpc_timeout = 180
 
         # Set -maxmempool=0 to turn off mempool memory sharing with dbcache
         # Set -rpcservertimeout=900 to reduce socket disconnects in this
@@ -54,7 +64,8 @@ class ChainstateWriteCrashTest(BitcoinTestFramework):
         self.node2_args = ["-dbcrashratio=24", "-dbcache=16"] + self.base_args
 
         # Node3 is a normal node with default args, except will mine full blocks
-        self.node3_args = ["-blockmaxweight=4000000"]
+        # and non-standard txs (e.g. txs with "dust" outputs)
+        self.node3_args = ["-blockmaxweight=4000000", "-acceptnonstdtxn"]
         self.extra_args = [self.node0_args, self.node1_args, self.node2_args, self.node3_args]
 
     def skip_test_if_missing_module(self):
diff --git a/test/functional/feature_fee_estimation.py b/test/functional/feature_fee_estimation.py
index a4b9f213a17..071f7d5ccac 100755
--- a/test/functional/feature_fee_estimation.py
+++ b/test/functional/feature_fee_estimation.py
@@ -120,9 +120,16 @@ def check_estimates(node, fees_seen):
         else:
             assert_greater_than_or_equal(i + 1, e["blocks"])
 
+
 class EstimateFeeTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 3
+        # mine non-standard txs (e.g. txs with "dust" outputs)
+        self.extra_args = [
+            ["-acceptnonstdtxn", "-maxorphantx=1000", "-whitelist=127.0.0.1"],
+            ["-acceptnonstdtxn", "-blockmaxweight=68000", "-maxorphantx=1000"],
+            ["-acceptnonstdtxn", "-blockmaxweight=32000", "-maxorphantx=1000"],
+        ]
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
@@ -133,9 +140,7 @@ class EstimateFeeTest(BitcoinTestFramework):
         But first we need to use one node to create a lot of outputs
         which we will use to generate our transactions.
         """
-        self.add_nodes(3, extra_args=[["-maxorphantx=1000", "-whitelist=127.0.0.1"],
-                                      ["-blockmaxweight=68000", "-maxorphantx=1000"],
-                                      ["-blockmaxweight=32000", "-maxorphantx=1000"]])
+        self.add_nodes(3, extra_args=self.extra_args)
         # Use node0 to mine blocks for input splitting
         # Node1 mines small blocks but that are bigger than the expected transaction rate.
         # NOTE: the CreateNewBlock code starts counting block weight at 4,000 weight,