diff --git a/packages/webpack/src/plugins/vue/modern.js b/packages/webpack/src/plugins/vue/modern.js
index 7878927d86..52f450fd37 100644
--- a/packages/webpack/src/plugins/vue/modern.js
+++ b/packages/webpack/src/plugins/vue/modern.js
@@ -7,8 +7,8 @@ import EventEmitter from 'events'
 import HtmlWebpackPlugin from 'html-webpack-plugin'
 import { safariNoModuleFix } from '@nuxt/utils'
 
-const assetsMap = {}
-const watcher = new EventEmitter()
+const legacyTemplateTags = {}
+const legacyTemplateWatcher = new EventEmitter()
 
 export default class ModernModePlugin {
   constructor ({ targetDir, isModernBuild, noUnsafeInline }) {
@@ -25,24 +25,15 @@ export default class ModernModePlugin {
     }
   }
 
-  get assets () {
-    return assetsMap
-  }
-
-  set assets ({ name, content }) {
-    assetsMap[name] = content
-    watcher.emit(name)
-  }
-
-  getAssets (name) {
+  getLegacyTemplateTags (name) {
     return new Promise((resolve) => {
-      const asset = this.assets[name]
-      if (asset) {
-        return resolve(asset)
+      const tags = legacyTemplateTags[name]
+      if (tags) {
+        return resolve(tags)
       }
-      return watcher.once(name, () => {
-        const asset = this.assets[name]
-        return asset && resolve(asset)
+      return legacyTemplateWatcher.once(name, () => {
+        const tags = legacyTemplateTags[name]
+        return tags && resolve(tags)
       })
     })
   }
@@ -50,14 +41,13 @@ export default class ModernModePlugin {
   applyLegacy (compiler) {
     const ID = 'nuxt-legacy-bundle'
     compiler.hooks.compilation.tap(ID, (compilation) => {
-      HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tapAsync(ID, (data, cb) => {
-        // get stats, write to disk
-        this.assets = {
-          name: data.plugin.options.filename,
-          content: data.bodyTags
-        }
-
-        cb()
+      HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tap(ID, (data) => {
+        HtmlWebpackPlugin.getHooks(compilation).afterEmit.tap(ID, ({ outputName }) => {
+          // get stats, write to disk
+          legacyTemplateTags[data.plugin.options.filename] = data.bodyTags
+          legacyTemplateWatcher.emit(outputName)
+        })
+        return data
       })
     })
   }
@@ -65,7 +55,7 @@ export default class ModernModePlugin {
   applyModern (compiler) {
     const ID = 'nuxt-modern-bundle'
     compiler.hooks.compilation.tap(ID, (compilation) => {
-      HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tapAsync(ID, async (data, cb) => {
+      HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tapPromise(ID, async (data) => {
         // use <script type="module"> for modern assets
         data.bodyTags.forEach((tag) => {
           if (tag.tagName === 'script' && tag.attributes) {
@@ -85,10 +75,10 @@ export default class ModernModePlugin {
 
         // inject links for legacy assets as <script nomodule>
         const fileName = data.plugin.options.filename
-        const legacyAssets = (await this.getAssets(fileName))
+        const legacyScriptTags = (await this.getLegacyTemplateTags(fileName))
           .filter(a => a.tagName === 'script' && a.attributes)
 
-        for (const a of legacyAssets) {
+        for (const a of legacyScriptTags) {
           a.attributes.nomodule = true
           data.bodyTags.push(a)
         }
@@ -96,7 +86,7 @@ export default class ModernModePlugin {
         if (this.noUnsafeInline) {
           // inject the fix as an external script
           const safariFixFilename = 'safari-nomodule-fix.js'
-          const safariFixPath = legacyAssets[0].attributes.src
+          const safariFixPath = legacyScriptTags[0].attributes.src
             .split('/')
             .slice(0, -1)
             .concat([safariFixFilename])
@@ -122,8 +112,9 @@ export default class ModernModePlugin {
           })
         }
 
-        delete assetsMap[fileName]
-        cb()
+        delete legacyTemplateTags[fileName]
+
+        return data
       })
     })
   }