diff --git a/lib/internal/http2/core.js b/lib/internal/http2/core.js
index cca254be3f8559..5e930ad216a1f5 100644
--- a/lib/internal/http2/core.js
+++ b/lib/internal/http2/core.js
@@ -13,7 +13,9 @@ const {
   ObjectPrototypeHasOwnProperty,
   Promise,
   ReflectApply,
+  ReflectGet,
   ReflectGetPrototypeOf,
+  ReflectSet,
   Set,
   Symbol,
   Uint32Array,
@@ -933,6 +935,36 @@ const validateSettings = hideStackFrames((settings) => {
   }
 });
 
+// Wrap a typed array in a proxy, and allow selectively copying the entries
+// that have explicitly been set to another typed array.
+function trackAssignmentsTypedArray(typedArray) {
+  const typedArrayLength = typedArray.length;
+  const modifiedEntries = new Uint8Array(typedArrayLength);
+
+  function copyAssigned(target) {
+    for (let i = 0; i < typedArrayLength; i++) {
+      if (modifiedEntries[i]) {
+        target[i] = typedArray[i];
+      }
+    }
+  }
+
+  return new Proxy(typedArray, {
+    get(obj, prop, receiver) {
+      if (prop === 'copyAssigned') {
+        return copyAssigned;
+      }
+      return ReflectGet(obj, prop, receiver);
+    },
+    set(obj, prop, value) {
+      if (`${+prop}` === prop) {
+        modifiedEntries[prop] = 1;
+      }
+      return ReflectSet(obj, prop, value);
+    }
+  });
+}
+
 // Creates the internal binding.Http2Session handle for an Http2Session
 // instance. This occurs only after the socket connection has been
 // established. Note: the binding.Http2Session will take over ownership
@@ -963,10 +995,13 @@ function setupHandle(socket, type, options) {
   handle.consume(socket._handle);
 
   this[kHandle] = handle;
-  if (this[kNativeFields])
-    handle.fields.set(this[kNativeFields]);
-  else
-    this[kNativeFields] = handle.fields;
+  if (this[kNativeFields]) {
+    // If some options have already been set before the handle existed, copy
+    // those (and only those) that have manually been set over.
+    this[kNativeFields].copyAssigned(handle.fields);
+  }
+
+  this[kNativeFields] = handle.fields;
 
   if (socket.encrypted) {
     this[kAlpnProtocol] = socket.alpnProtocol;
@@ -1018,7 +1053,8 @@ function cleanupSession(session) {
   session[kProxySocket] = undefined;
   session[kSocket] = undefined;
   session[kHandle] = undefined;
-  session[kNativeFields] = new Uint8Array(kSessionUint8FieldCount);
+  session[kNativeFields] = trackAssignmentsTypedArray(
+    new Uint8Array(kSessionUint8FieldCount));
   if (handle)
     handle.ondone = null;
   if (socket) {
@@ -1184,8 +1220,10 @@ class Http2Session extends EventEmitter {
       setupFn();
     }
 
-    if (!this[kNativeFields])
-      this[kNativeFields] = new Uint8Array(kSessionUint8FieldCount);
+    if (!this[kNativeFields]) {
+      this[kNativeFields] = trackAssignmentsTypedArray(
+        new Uint8Array(kSessionUint8FieldCount));
+    }
     this.on('newListener', sessionListenerAdded);
     this.on('removeListener', sessionListenerRemoved);