Try alternative

Author: JoviDeCroock

packages/core/src/runtime/unmount.js

@@ -7,10 +7,10 @@ options.unmount = vnode => {
   if (typeof type === 'function' && vnodesForComponent.has(type)) {
     const vnodes = vnodesForComponent.get(type);
     if (vnodes) {
-      const mountedVnodesForType = vnodes.filter(
-        p => p.__c && p.__c !== vnode.__c
-      );
-      vnodesForComponent.set(vnode.type, mountedVnodesForType);
+      const index = vnodes.indexOf(vnode);
+      if (index !== -1) {
+        vnodes.splice(index, 1);
+      }
     }
   }
 

packages/core/src/runtime/vnode.js

@@ -1,5 +1,9 @@
 import { options } from 'preact';
-import { vnodesForComponent, mappedVNodes, lastSeen } from './vnodesForComponent';
+import {
+  vnodesForComponent,
+  mappedVNodes,
+  lastSeen,
+} from './vnodesForComponent';
 import { VNODE_COMPONENT } from '../constants';
 
 const getMappedVnode = type => {
@@ -13,11 +17,11 @@ const getMappedVnode = type => {
 const BUILT_IN_COMPONENTS = ['Fragment', 'Suspense', 'SuspenseList'];
 
 const isBuiltIn = type => {
-  return BUILT_IN_COMPONENTS.includes(type.name)
-}
+  return BUILT_IN_COMPONENTS.includes(type.name);
+};
 
-const oldVnode = options.vnode;
-options.vnode = vnode => {
+const oldVnode = options.__b;
+options.__b = vnode => {
   if (vnode && typeof vnode.type === 'function' && !isBuiltIn(vnode.type)) {
     const vnodes = vnodesForComponent.get(vnode.type);
     if (!vnodes) {