async_hooks: switch between native and context hooks correctly

🤦 Might help if I remember to disable the _other_ promise
hook implementation when switching between them...

Fixes nodejs#38814
Fixes nodejs#38815

lib/internal/async_hooks.js

@@ -357,7 +357,9 @@ function updatePromiseHookMode() {
   wantPromiseHook = true;
   if (destroyHooksExist()) {
     enablePromiseHook();
+    setPromiseHooks(undefined, undefined, undefined, undefined);
   } else {
+    disablePromiseHook();
     setPromiseHooks(
       initHooksExist() ? promiseInitHook : undefined,
       promiseBeforeHook,

test/parallel/test-async-hooks-correctly-switch-promise-hook.js

@@ -0,0 +1,59 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const async_hooks = require('async_hooks');
+
+// Regression test for:
+// - https://github.com/nodejs/node/issues/38814
+// - https://github.com/nodejs/node/issues/38815
+
+const expected = [
+  ['init', 2, 'PROMISE', 1],
+  ['init', 3, 'PROMISE', 1],
+  ['promiseResolve', 3],
+  ['promiseResolve', 2],
+  ['before', 2],
+  ['init', 4, 'PROMISE', 3],
+  ['after', 2],
+  ['before', 4],
+  ['promiseResolve', 2],
+  ['promiseResolve', 4],
+  ['after', 4]
+]
+
+const actual = []
+
+// Only init to start context-based promise hook
+async_hooks.createHook({
+  init () { }
+}).enable();
+
+// With destroy, this should switch to native
+// and disable context - based promise hook
+async_hooks.createHook({
+  init (asyncId, type, triggerAsyncId) {
+    actual.push([ 'init', asyncId, type, triggerAsyncId ]);
+  },
+  before (asyncId) {
+    actual.push([ 'before', asyncId ]);
+  },
+  after (asyncId) {
+    actual.push([ 'after', asyncId ]);
+  },
+  promiseResolve (asyncId) {
+    actual.push([ 'promiseResolve', asyncId ]);
+  },
+  destroy (asyncId) {
+    actual.push([ 'destroy', asyncId ]);
+  }
+}).enable();
+
+async function main () {
+  return Promise.resolve();
+}
+
+main();
+
+process.on('exit', () => {
+  assert.deepStrictEqual(actual, expected);
+});