diff --git a/test/sanitizer_suppressions/tsan b/test/sanitizer_suppressions/tsan
--- a/test/sanitizer_suppressions/tsan
+++ b/test/sanitizer_suppressions/tsan
@@ -1,5 +1,7 @@
 # ThreadSanitizer suppressions
 # ============================
+#
+# https://github.com/google/sanitizers/wiki/ThreadSanitizerSuppressions
 
 # double locks (TODO fix)
 mutex:g_genesis_wait_mutex
@@ -51,6 +53,15 @@
 deadlock:libdb
 thread:src/leveldb/*
 
+# Intermittent issues
+# -------------------
+#
+# Suppressions that follow might only happen intermittently, thus they are not
+# reproducible. Make sure to include a link to a full trace.
+
+# https://github.com/bitcoin/bitcoin/issues/20618
+race:CZMQAbstractPublishNotifier::SendZmqMessage
+
 # Reverselock tests is triggering lock-order-inversion errors when run as part
 # of test_bitcoin.
 deadlock:reverselock_tests::reverselock_errors