diff --git a/wagtail/admin/wagtail_hooks.py b/wagtail/admin/wagtail_hooks.py
index a03dcff4e..23536f634 100644
--- a/wagtail/admin/wagtail_hooks.py
+++ b/wagtail/admin/wagtail_hooks.py
@@ -6,12 +6,15 @@ from wagtail.admin.menu import MenuItem, SubmenuMenuItem, settings_menu
 from wagtail.admin.navigation import get_explorable_root_page
 from wagtail.admin.rich_text import (
     HalloFormatPlugin, HalloHeadingPlugin, HalloListPlugin, HalloPlugin)
+from wagtail.admin.rich_text.converters.editor_html import LinkTypeRule, WhitelistRule
 from wagtail.admin.search import SearchArea
 from wagtail.admin.utils import user_has_any_page_permission
 from wagtail.admin.viewsets import viewsets
 from wagtail.admin.widgets import Button, ButtonWithDropdownFromHook, PageListingButton
 from wagtail.core import hooks
 from wagtail.core.permissions import collection_permission_policy
+from wagtail.core.rich_text.pages import PageLinkHandler
+from wagtail.core.whitelist import allow_without_attributes, attribute_rule, check_url
 
 
 class ExplorerMenuItem(MenuItem):
@@ -189,6 +192,9 @@ def register_core_features(features):
             order=45,
         )
     )
+    features.register_converter_rule('editorhtml', 'hr', [
+        WhitelistRule('hr', allow_without_attributes)
+    ])
 
     features.register_editor_plugin(
         'hallo', 'link',
@@ -197,24 +203,47 @@ def register_core_features(features):
             js=['wagtailadmin/js/hallo-plugins/hallo-wagtaillink.js'],
         )
     )
+    features.register_converter_rule('editorhtml', 'link', [
+        WhitelistRule('a', attribute_rule({'href': check_url})),
+        LinkTypeRule('page', PageLinkHandler),
+    ])
 
     features.register_editor_plugin(
         'hallo', 'bold', HalloFormatPlugin(format_name='bold')
     )
+    features.register_converter_rule('editorhtml', 'bold', [
+        WhitelistRule('b', allow_without_attributes),
+        WhitelistRule('strong', allow_without_attributes),
+    ])
 
     features.register_editor_plugin(
         'hallo', 'italic', HalloFormatPlugin(format_name='italic')
     )
+    features.register_converter_rule('editorhtml', 'italic', [
+        WhitelistRule('i', allow_without_attributes),
+        WhitelistRule('em', allow_without_attributes),
+    ])
 
     for element in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
         features.register_editor_plugin(
             'hallo', element, HalloHeadingPlugin(element=element)
         )
+        features.register_converter_rule('editorhtml', element, [
+            WhitelistRule(element, allow_without_attributes)
+        ])
 
     features.register_editor_plugin(
         'hallo', 'ol', HalloListPlugin(list_type='ordered')
     )
+    features.register_converter_rule('editorhtml', 'ol', [
+        WhitelistRule('ol', allow_without_attributes),
+        WhitelistRule('li', allow_without_attributes),
+    ])
 
     features.register_editor_plugin(
         'hallo', 'ul', HalloListPlugin(list_type='unordered')
     )
+    features.register_converter_rule('editorhtml', 'ul', [
+        WhitelistRule('ul', allow_without_attributes),
+        WhitelistRule('li', allow_without_attributes),
+    ])
diff --git a/wagtail/core/wagtail_hooks.py b/wagtail/core/wagtail_hooks.py
index 48cb5146d..5590aa304 100644
--- a/wagtail/core/wagtail_hooks.py
+++ b/wagtail/core/wagtail_hooks.py
@@ -2,11 +2,9 @@ from django.conf import settings
 from django.contrib.auth.views import redirect_to_login
 from django.urls import reverse
 
-from wagtail.admin.rich_text.converters.editor_html import LinkTypeRule, WhitelistRule
 from wagtail.core import hooks
 from wagtail.core.models import PageViewRestriction
-from wagtail.core.rich_text.pages import PageLinkHandler, page_linktype_handler
-from wagtail.core.whitelist import allow_without_attributes, attribute_rule, check_url
+from wagtail.core.rich_text.pages import page_linktype_handler
 
 
 def require_wagtail_login(next):
@@ -39,43 +37,16 @@ def check_view_restrictions(page, request, serve_args, serve_kwargs):
 @hooks.register('register_rich_text_features')
 def register_core_features(features):
     features.default_features.append('hr')
-    features.register_converter_rule('editorhtml', 'hr', [
-        WhitelistRule('hr', allow_without_attributes)
-    ])
 
     features.default_features.append('link')
-    features.register_converter_rule('editorhtml', 'link', [
-        WhitelistRule('a', attribute_rule({'href': check_url})),
-        LinkTypeRule('page', PageLinkHandler),
-    ])
     features.register_link_type('page', page_linktype_handler)
 
     features.default_features.append('bold')
-    features.register_converter_rule('editorhtml', 'bold', [
-        WhitelistRule('b', allow_without_attributes),
-        WhitelistRule('strong', allow_without_attributes),
-    ])
 
     features.default_features.append('italic')
-    features.register_converter_rule('editorhtml', 'italic', [
-        WhitelistRule('i', allow_without_attributes),
-        WhitelistRule('em', allow_without_attributes),
-    ])
 
     features.default_features.extend(['h2', 'h3', 'h4'])
-    for element in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
-        features.register_converter_rule('editorhtml', element, [
-            WhitelistRule(element, allow_without_attributes)
-        ])
 
     features.default_features.append('ol')
-    features.register_converter_rule('editorhtml', 'ol', [
-        WhitelistRule('ol', allow_without_attributes),
-        WhitelistRule('li', allow_without_attributes),
-    ])
 
     features.default_features.append('ul')
-    features.register_converter_rule('editorhtml', 'ul', [
-        WhitelistRule('ul', allow_without_attributes),
-        WhitelistRule('li', allow_without_attributes),
-    ])